Merge pull request #4768 from picklesrus/fix-prop-warning

Fix prop type. muteStepContent is an array not a string.

src/components/modal/mute/modal.jsx

@@ -128,7 +128,7 @@ MuteModal.propTypes = {
     muteModalMessages: PropTypes.shape({
         commentType: PropTypes.string,
         muteStepHeader: PropTypes.string,
-        muteStepContent: PropTypes.string
+        muteStepContent: PropTypes.array
     }),
     onRequestClose: PropTypes.func,
     timeMuted: PropTypes.string