Change "yu" to "you" in combo docs (#6510)

docs/feature_combo.md

@@ -2,7 +2,7 @@
 
 The Combo feature is a chording type solution for adding custom actions.  It lets you hit multiple keys at once and produce a different effect.  For instance, hitting `A` and `S` within the tapping term would hit `ESC` instead, or have it perform even more complex tasks.
 
-To enable this feature, yu need to add `COMBO_ENABLE = yes` to your `rules.mk`.
+To enable this feature, you need to add `COMBO_ENABLE = yes` to your `rules.mk`.
 
 Additionally, in your `config.h`, you'll need to specify the number of combos that you'll be using, by adding `#define COMBO_COUNT 1` (replacing 1 with the number that you're using).
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