Merge pull request #16547 from wordpress-mobile/gutenberg/chore/updat…

…e-xpost-comment-for-clarification

[RNMobile] Update code comment for clarity

WordPress/src/main/java/org/wordpress/android/ui/posts/EditPostActivity.java

@@ -2305,7 +2305,9 @@ private GutenbergPropsBuilder getGutenbergPropsBuilder() {
         String languageString = LocaleManager.getLanguage(EditPostActivity.this);
         String wpcomLocaleSlug = languageString.replace("_", "-").toLowerCase(Locale.ENGLISH);
 
-        // If this.mIsXPostsCapable has not been set, default to allowing xPosts
+        // this.mIsXPostsCapable may return true for non-WP.com sites, but the app only supports xPosts for P2-based
+        // WP.com sites so, gate with `isUsingWpComRestApi()`
+        // If this.mIsXPostsCapable has not been set, default to allowing xPosts.
         boolean enableXPosts = mSite.isUsingWpComRestApi() && (mIsXPostsCapable == null || mIsXPostsCapable);
 
         EditorTheme editorTheme = mEditorThemeStore.getEditorThemeForSite(mSite);