Move information about diffs to correct heading

Author: pradyunsg

README.md

@@ -179,6 +179,13 @@ jobs:
             console.log(result)
 ```
 
+_(Note that this particular example only works for a public URL, where the
+diff URL is publicly accessible. Getting the diff for a private URL requires
+using the API.)_
+
+This will print the full diff object in the screen; `result.data` will
+contain the actual diff text.
+
 ### Run custom GraphQL queries
 
 You can use the `github.graphql` object to run custom GraphQL queries against the GitHub API.
@@ -212,13 +219,6 @@ jobs:
 
 ```
 
-_(Note that this particular example only works for a public URL, where the
-diff URL is publicly accessible. Getting the diff for a private URL requires
-using the API.)_
-
-This will print the full diff object in the screen; `result.data` will
-contain the actual diff text.
-
 ### Run a separate file
 
 If you don't want to inline your entire script that you want to run, you can