Remove the reference to FishEye and Stash from Commit tab in JIRA

The "Commits" tab is used to display Github and Bitbucket repository data via the JIRA DVCS Connector. The "Source" tab is used to display data from Stash and FishEye.

However currently there are references to FishEye and Stash on the Commit tab in JIRA - which can generate questions. These references should be removed.