Improve the Git documentation

The Git documentation needs to be reviewed and updated.

See the following customer comments:

• http://confluence.atlassian.com/display/FISHEYE/Git?focusedCommentId=223216779#comment-223216779
• http://confluence.atlassian.com/display/FISHEYE/Git?focusedCommentId=224396068#comment-224396068

Collated Customer Comments

• (listed below) Provide a sample of how to integrate with a private repository. For example, a repository managed with gitosis.
• Provide examples of what a repository location should look like.
• Provide instructions on how to add a file-system based repository.
• Provide details on how instructions differ for Windows.
• Provide information on Git branches and how they are handled.