Fix documentation about one shot tap toggle

Based on conversation with Drashna on Discord, we know that if ONE_SHOT_TAP_TOGGLE is 5, then tapping a one shot mod key 5 times holds the one shot key permanently, but to come out of this, you need to press the same key only once.

docs/feature_advanced_keycodes.md

@@ -146,7 +146,7 @@ Additionally, hitting keys five times in a short period will lock that key. This
 You can control the behavior of one shot keys by defining these in `config.h`:
 
 ```c
-#define ONESHOT_TAP_TOGGLE 5  /* Tapping this number of times holds the key until tapped this number of times again. */
+#define ONESHOT_TAP_TOGGLE 5  /* Tapping this number of times holds the key until tapped once again. */
 #define ONESHOT_TIMEOUT 5000  /* Time (in ms) before the one shot key is released */
 ```