Fix asciidoc errors

Author: matteosuppo

Language/Functions/USB/Keyboard/keyboardBegin.adoc

@@ -31,7 +31,6 @@ Nothing
 === Returns
 Nothing
 
---
 // OVERVIEW SECTION ENDS
 
 

Language/Functions/USB/Keyboard/keyboardModifiers.adoc

@@ -28,7 +28,6 @@ The Leonardo's definitions for modifier keys are listed below:
 
 |===
 |Key	|Hexadecimal value	|Decimal value
-
 |KEY_LEFT_CTRL	|0x80	|128
 |KEY_LEFT_SHIFT	|0x81	|129
 |KEY_LEFT_ALT	|0x82	|130
@@ -64,6 +63,6 @@ The Leonardo's definitions for modifier keys are listed below:
 |KEY_F10	|0xCB	|203
 |KEY_F11	|0xCC	|204
 |KEY_F12	|0xCD	|205
-
+|===
 --
 // OVERVIEW SECTION ENDS

Language/Variables/Data Types/String/Functions/reserve.adoc

@@ -72,6 +72,7 @@ void loop() {
 }
  
 ----
+--
 // HOW TO USE SECTION ENDS
 
 
@@ -85,5 +86,4 @@ void loop() {
 [role="example"]
 * #EXAMPLE# link: https://www.arduino.cc/en/Tutorial/BuiltInExamples#strings[Built-in String Tutorials]
 --
-// SEE ALSO SECTION ENDS
 // SEE ALSO SECTION ENDS