keyboardModifiers: Implement review suggestions

Apply changes suggested by @per1234 on pull-request review:

- fix typo
- use common conventions for key names and key combinations
- reduce unnecessary verbosity.

Co-authored-by: per1234 <accounts@perglass.com>

Author: edgar-bonet

Language/Functions/USB/Keyboard/keyboardModifiers.adoc

@@ -20,37 +20,37 @@ When given a printable ASCII character as an argument, the functions `Keyboard.w
 Keyboard.write('a');  // press and release the 'A' key
 Keyboard.write('A');  // press Shift and 'A', then release both
 ----
-A typical keyboard, however, has many keys that do not match a printable ASCII character. In order to simulate those keys, the library provides a set of macros that can be passed as arguments to `Keyboard.write()`, `Keyboard.press()` and `Keyboard.release()`. For example, the key combination Shift-F2 can be generated by:
+A typical keyboard, however, has many keys that do not match a printable ASCII character. In order to simulate those keys, the library provides a set of macros that can be passed as arguments to `Keyboard.write()`, `Keyboard.press()` and `Keyboard.release()`. For example, the key combination Shift+F2 can be generated by:
 [source,arduino]
 ----
 Keyboard.press(KEY_LEFT_SHIFT);  // press and hold Shift
 Keyboard.press(KEY_F2);          // press and hold F2
 Keyboard.releaseAll();           // release both
 ----
-Note that, in order to press multiple keys simultaneously, one has to use link:../keyboardpress[`Keyboard.press()`] rather than link:../keyboardwrite[`Keyboard.write()`], as the latter just “hits” the keys (it presses and immediate releases them).
+Note that, in order to press multiple keys simultaneously, one has to use link:../keyboardpress[`Keyboard.press()`] rather than link:../keyboardwrite[`Keyboard.write()`], as the latter just “hits” the keys (it presses and immediately releases them).
 [%hardbreaks]
 The available macros are listed below:
 
 [float]
 === Keyboard modifiers
-These are eight keys within the alphanumeric cluster of the keyboard that are meant to modify the normal action of another key when the two are pressed in combination. Whereas Shift and AltGr are used to access extra characters, the others are mostly used for keyboard shortcuts.
+These keys are meant to modify the normal action of another key when the two are pressed in combination.
 
 |===
 |Key	|Hexadecimal value	|Decimal value	|Notes
 
 |KEY_LEFT_CTRL  |0x80 |128 |
 |KEY_LEFT_SHIFT |0x81 |129 |
-|KEY_LEFT_ALT   |0x82 |130 |option (⌥) on Mac
-|KEY_LEFT_GUI   |0x83 |131 |OS logo, command (⌘) on Mac
+|KEY_LEFT_ALT   |0x82 |130 |Option (⌥) on Mac
+|KEY_LEFT_GUI   |0x83 |131 |OS logo, Command (⌘) on Mac
 |KEY_RIGHT_CTRL |0x84 |132 |
 |KEY_RIGHT_SHIFT |0x85 |133 |
-|KEY_RIGHT_ALT  |0x86 |134 |also AltGr, option (⌥) on Mac
-|KEY_RIGHT_GUI  |0x87 |135 |OS logo, command (⌘) on Mac
+|KEY_RIGHT_ALT  |0x86 |134 |also AltGr, Option (⌥) on Mac
+|KEY_RIGHT_GUI  |0x87 |135 |OS logo, Command (⌘) on Mac
 |===
 
 [float]
 === Special keys
-These are all the keys that do not match a printable ASCII character and are not modifiers, including all keys outside the alphanumeric cluster.
+These are all the keys that do not match a printable ASCII character and are not modifiers.
 
 [float]
 ==== Within the alphanumeric cluster
@@ -84,7 +84,7 @@ These are all the keys that do not match a printable ASCII character and are not
 
 [float]
 ==== Escape and function keys
-The library can simulate function keys up to F24, even though few keyboards have the F13… F24 keys.
+The library can simulate function keys up to F24.
 
 |===
 |Key	|Hexadecimal value	|Decimal value