Correct typos in comments and documentation

Author: per1234

examples/PhysicsLabFirmware/PhysicsLabFirmware.ino

@@ -81,13 +81,13 @@ void setup() {
   digitalWrite(RESISTANCE_AUX_PIN, LOW);
 
   if (!INA226.begin(0x45)) {
-    Serial.println("Failled to initialized INA226!");
+    Serial.println("Failed to initialized INA226!");
 
     while (1);
   }
 
   if (!imu.begin()) {
-    Serial.println("Failled to initialized IMU!");
+    Serial.println("Failed to initialized IMU!");
 
     while (1);
   }
@@ -97,7 +97,7 @@ void setup() {
   imu.setupGyro(imu.LSM9DS1_GYROSCALE_245DPS);
 
   if (!BLE.begin()) {
-    Serial.println("Failled to initialized BLE!");
+    Serial.println("Failed to initialized BLE!");
 
     while (1);
   }

extras/BLE_spec BLE Sense Firmware.txt

@@ -1,10 +1,10 @@
 BLE Sense - BLE specifications.txt
 ==================================
 
-GAP (Adversisement)
+GAP (Advertisement)
 -------------------
 Local name:    BLESense - <last 4 characters of BT address>
-Serivice UUID: 555a0002-0000-467a-9538-01f0652c74e8
+Service UUID: 555a0002-0000-467a-9538-01f0652c74e8
 
 
 GATT

extras/BLE_spec MKR Science Kit Firmware.txt

@@ -2,10 +2,10 @@ MKR Science Kit Firmware - BLE specifications.txt
 =================================================
 
 
-GAP (Adversisement)
+GAP (Advertisement)
 -------------------
 Local name:    MKRSci<last 4 characters of BT address>
-Serivice UUID: 555a0001-0000-467a-9538-01f0652c74e8
+Service UUID: 555a0001-0000-467a-9538-01f0652c74e8
 
 
 GATT
@@ -114,7 +114,7 @@ UUID:       555a0001-5001-467a-9538-01f0652c74e8
 Properties: notify
 Value size: 12 bytes
 Data format: Array of 3 x 32-bit IEEE floats (little endian)
-Description: X, Y, Z acceleration values in G's, if subscribed notification sent every 10 ms
+Description: X, Y, Z acceleration values in g's, if subscribed notification sent every 10 ms
 
 Gyroscope Characteristic
 ~~~~~~~~~~~~~~~~~~~~~~~~