add space between words

Summary: Closes facebook#7045

Differential Revision: D3194558

fb-gh-sync-id: 57691d4d54bbe2bdce6abf885b6aa0f341f12644
fbshipit-source-id: 57691d4d54bbe2bdce6abf885b6aa0f341f12644

Author: TETRA2000

ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManagerImpl.java

@@ -370,7 +370,7 @@ public void createReactContextInBackground() {
     Assertions.assertCondition(
         !mHasStartedCreatingInitialContext,
         "createReactContextInBackground should only be called when creating the react " +
-            "application for the first time. When reloading JS, e.g. from a new file, explicitly" +
+            "application for the first time. When reloading JS, e.g. from a new file, explicitly " +
             "use recreateReactContextInBackground");
 
     mHasStartedCreatingInitialContext = true;