Update some docs

internal/action/actions.go

@@ -1467,3 +1467,7 @@ func (h *BufPane) RemoveAllMultiCursors() bool {
 	h.multiWord = false
 	return true
 }
+
+func (h *BufPane) None() bool {
+	return false
+}

internal/action/bufpane.go

@@ -510,6 +510,7 @@ var BufKeyActions = map[string]BufKeyAction{
 	"RemoveAllMultiCursors":  (*BufPane).RemoveAllMultiCursors,
 	"SkipMultiCursor":        (*BufPane).SkipMultiCursor,
 	"JumpToMatchingBrace":    (*BufPane).JumpToMatchingBrace,
+	"None":                   (*BufPane).None,
 
 	// This was changed to InsertNewline but I don't want to break backwards compatibility
 	"InsertEnter": (*BufPane).InsertNewline,