Spelling fixes in README

Author: PilnyTomas

libraries/BluetoothSerial/README.md

@@ -25,12 +25,12 @@ There are 3 basic use cases: phone, other ESP32 or any MCU with BT serial module
 
 #### ESP32
 
-You can flash one of the ESP32 with example [`SerialToSerialBTM`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBTM/SerialToSerialBTM.ino) (the Master) and another ESP32 with [`SerialToSerialBT`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino) (the Slave).
-Those examples are pre-set to work out-of-the box but they should be scalable to connect multiple Slaves to the Master.
+You can flash one of the ESP32 with the example [`SerialToSerialBTM`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBTM/SerialToSerialBTM.ino) (the Master) and another ESP32 with [`SerialToSerialBT`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino) (the Slave).
+Those examples are preset to work out-of-the-box but they should be scalable to connect multiple Slaves to the Master.
 
 #### 3rd party Serial BT module
 
-Using 3rd party Serial BT module will require to study the documentation of the particular module in order to make it work, however one side can utilize the mentioned [`SerialToSerialBTM`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBTM/SerialToSerialBTM.ino) (the Master) or [`SerialToSerialBT`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino) (the Slave).
+Using 3rd party Serial BT module will require to study the documentation of the particular module in order to make it work, however, one side can utilize the mentioned [`SerialToSerialBTM`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBTM/SerialToSerialBTM.ino) (the Master) or [`SerialToSerialBT`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino) (the Slave).
 
 ### Pairing options
 
@@ -46,12 +46,12 @@ This method will authenticate automatically any attempt to pair and should not b
 
 ### With SSP
 
-Usage of SSP provides secure connection. This option is demonstrated in example [`SerialToSerialBT_SSP`](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT_SSP/SerialToSerialBT_SSP.ino)
+The usage of SSP provides a secure connection. This option is demonstrated in the example `SerialToSerialBT_SSP``](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/SerialToSerialBT_SSP/SerialToSerialBT_SSP.ino)
 
-The Secure Simple Pairing is enable by calling method `enableSSP` which has two variants - one is backward compatible without parameter `enableSSP()` and second with parameters `enableSSP(bool inputCapability, bool outputCapability)`.
-Alternatively the SSP can be disabled by `disableSSP()`
+The Secure Simple Pairing is enabled by calling method `enableSSP` which has two variants - one is backward compatible without parameter `enableSSP()` and second with parameters `enableSSP(bool inputCapability, bool outputCapability)`.
+Alternatively, the SSP can be disabled by `disableSSP()`
 
-Both options must be called before `begin()` or if it is called after `begin()` the driver needs to be restart (call `end()` followed by `begin()`) in order to take in effect enabling or disabling the SSP.
+Both options must be called before `begin()` or if it is called after `begin()` the driver needs to be restarted (call `end()` followed by `begin()`) in order to take in effect enabling or disabling the SSP.
 
 #### The parameters define the method of authentication:
 
@@ -61,7 +61,7 @@ Both options must be called before `begin()` or if it is called after `begin()`
 
 * **inputCapability=true and outputCapability=true**
     * Both devices display randomly generated code and if they match the user will authenticate pairing on both devices.
-    * This must be implemented registering callback via `onConfirmRequest()` and in this callback the user will input the response and call `confirmReply(true)` if the authenticated, otherwise call `confirmReply(false)` to reject the pairing.
+    * This must be implemented by registering a callback via `onConfirmRequest()` and in this callback the user will input the response and call `confirmReply(true)` if the authenticated, otherwise call `confirmReply(false)` to reject the pairing.
 * **inputCapability=false and outputCapability=false**
     * Only the other device authenticates pairing without any pin.
 * **inputCapability=false and outputCapability=true**
@@ -74,5 +74,6 @@ Both options must be called before `begin()` or if it is called after `begin()`
 
 To use Legacy pairing you will have to use [Arduino as an IDF component](https://espressif-docs.readthedocs-hosted.com/projects/arduino-esp32/en/latest/esp-idf_component.html) and disable option `CONFIG_BT_SSP_ENABLED`.
 Please refer to the documentation on how to setup Arduino as an IDF component and when you are done, run `idf.py menuconfig` navigate to `Component Config -> Bluetooth -> Bluedroid -> [ ] Secure Simple Pairing` and disable it.
-While in the menuconfig you will also need to change partition scheme `Partition Table -> Partition Table -> (X) Single Factory app (large), no OTA`.
-After these changes save & quit menuconfig a you are ready to go: `idf.py  monitor flash`.
+While in the menuconfig you will also need to change the partition scheme `Partition Table -> Partition Table -> (X) Single Factory app (large), no OTA`.
+After these changes save & quit menuconfig and you are ready to go: `idf.py  monitor flash`.
+Please note that to use the PIN in smartphones and computers you need to use characters `SerialBT.setPin("1234", 4);` not a number `SerialBT.setPin(1234, 4);` . Numbers CAN be used if the other side uses them too, but phones and computers use characters.