fix encoder docs

docs/feature_encoders.md

@@ -45,4 +45,4 @@ or `keymap.c`:
 
 ## Hardware
 
-The A an B lines of the encoders should be wired directly to the MCU, and the C/common lines should be wired to ground.
+The A and B lines of the encoders should be wired directly to the MCU, and the C/common lines should be wired to ground.