Docs: Clarify "right" -> "right-handed" (#3507)

I couldn't understand this sentence at first owing to the confusion
between right meaning "correct," and right meaning "right-handed."

docs/feature_advanced_keycodes.md

@@ -133,7 +133,7 @@ We've added shortcuts to make common modifier/tap (mod-tap) mappings more compac
 
 ?> Due to the way that keycodes are structured, any modifiers specified as part of `kc`, such as `LCTL()` or `KC_LPRN`, will only activate when held instead of tapped.
 
-?> Additionally, if there is at least one right modifier, any other modifiers will turn into their right equivalents, so it is not possible to "mix and match" the two.
+?> Additionally, if there is at least one right-handed modifier, any other modifiers in a chain of functions will turn into their right-handed equivalents, so it is not possible to "mix and match" the two.
 
 # One Shot Keys