fix: Fix typo in documentation for one shot keys. ON_TOGG -> OS_TOGG (#13754)

`ON_TOGG` doesn't exist in the codebase.

docs/one_shot_keys.md

@@ -19,7 +19,7 @@ You can control the behavior of one shot keys by defining these in `config.h`:
 * `OSL(layer)` - momentary switch to *layer*.
 * `OS_ON` - Turns on One Shot keys.
 * `OS_OFF` - Turns off One Shot keys. OSM act as regular mod keys, OSL act like `MO`.
-* `ON_TOGG` - Toggles the one shot key status.
+* `OS_TOGG` - Toggles the one shot key status.
 
 Sometimes, you want to activate a one-shot key as part of a macro or tap dance routine.