Fix some nits/typos in MapBuffer

Summary:
Was trying out some behaviour when using the MapBuffer experiment and fixed some small issues.

Changelog: [Internal]

Reviewed By: ShikaSD

Differential Revision: D34108859

fbshipit-source-id: 550ca0847419006ec17472cc4b70d38fc8d05396

ReactAndroid/src/main/java/com/facebook/react/uimanager/StateWrapper.java

@@ -25,7 +25,7 @@ public interface StateWrapper {
    * <p>Unstable API - DO NOT USE.
    */
   @Nullable
-  ReadableMapBuffer getStatDataMapBuffer();
+  ReadableMapBuffer getStateDataMapBuffer();
 
   /**
    * Get a ReadableNativeMap object from the C++ layer, which is a K/V map of string keys to values.