Fix for formatting and 2 typos.
Update elastic transcoder docs
Adding serial workflow recipe to SWF tutorial.
Fix #1792 by retrying 502, 504 HTTP errors.
Merge pull request #1798 from danielgtaylor/retry

Fixes #1798, #1792 by retrying 502, 504 HTTP errors.
Merge pull request #1797 from oozie/swf_tut

Adding a serial workflow recipe to SWF tutorial. Fixes #1797.
Add release notes for 2.15.0
Merge branch 'transcoder' into retry
Version bump to 2.15.0