Specified default for visible and enabled cursor, and event waiting

[RolandMarchand]

The reference documentation for the following on/off settings didn't specify which one was set by default. This PR fixes that. No logic code was modified.

void EnableEventWaiting(void);
void DisableEventWaiting(void);
void ShowCursor(void);
void HideCursor(void);
void EnableCursor(void);
void DisableCursor(void);

[raysan5]

@RolandMarchand thanks but I consider those anotations are not required