Update checkintool.md

Fixed a couple minor typos
Update list-remote-branches.md

Fixed some grammar issues
Merge pull request #668 from coryhouse/patch-2

Update list-remote-branches.md
Merge pull request #667 from coryhouse/patch-1

Update checkintool.md
Retry after getting a file from TFS if the status is not satisfying

Should improve reliability.
Hope it will fix #444
Encapsulate `NumFailures != 0`.