Cleaned up the docstrings a bit

src/msgPrintControl.h

@@ -145,7 +145,7 @@ class HIDDEN msgPrintControl {
      *
      * If the conditions for printing a message are met, `wantToPrint` must be
      * set to true. The function then checks if `maxRepetitions_` has been
-     * exceeded. If yes, the function returns no, indicating that the message
+     * exceeded. If yes, the function returns false, indicating that the message
      * should not be printed. If no, the number of repetitions stored in the map
      * is incremented and the function returns true, indicating that the message
      * should be printed.
@@ -168,7 +168,7 @@ class HIDDEN msgPrintControl {
 
     /**
      * @brief Like `shouldBePrinted(msgPrintControlKey key, bool wantToPrint)`,
-     * but constructs the key from the first four arguments.
+     * but constructs the key from the first four and the argument.
      *
      * @param controller_
      * @param axisNo