Apply nullsafe FIXMEs for xplat/js/react-native-github/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextViewManager.java

Summary:
Added nullsafe FIXMEs for easier reviewing of next diff, where we fix them
Changelog: [Internal]

Reviewed By: arushikesarwani94

Differential Revision: D72460133

fbshipit-source-id: 7673e962e50946b504e3bd9446b3aef962271241

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextViewManager.java

@@ -150,6 +150,7 @@ public class ReactTextViewManager
       if (stateMapBuffer != null) {
         return getReactTextUpdate(view, props, stateMapBuffer);
       } else {
+        // NULLSAFE_FIXME[Return Not Nullable]
         return null;
       }
     }
@@ -224,6 +225,7 @@ public class ReactTextViewManager
         widthMode,
         height,
         heightMode,
+        // NULLSAFE_FIXME[Parameter Not Nullable]
         mReactTextViewManagerCallback,
         attachmentsPositions);
   }