Restructure headlines & fix some typos in the TFS documentation

[pascalberger]

Restructure headlines to make stuff more clear and fix some typos in the TFS Build documentation.

Do you know if it is possible to make links relative? Currently they are linking to the latests version of the docs which is not ideal for the stable docs.

[JakeGinnivan]

Yeah, relative links will sort themselves out. You can also check https://readthedocs.org/builds/gitversion/ and have a look at the build, it tells you if there are dead links. Readthedocs is pretty awesome

[pascalberger]

So instead of [MSBuild Task](http://gitversion.readthedocs.org/en/latest/usage/#msbuild-task)the following variant will work [MSBuild Task](../../usage/#msbuild-task)?

Is there a readthedocs build available for PRs?

[JakeGinnivan]

I don't think it builds for PR's. But yeah, that relative path should work. I wonder if you could just go [MSBuild Task](/usage/#msbuild-task) - we can try? :P

[JakeGinnivan]

I have to run, if it worked cool, if it didn't I can fix up tomorrow (unless you beat me to it)

[pascalberger]

Seems to have worked fine :)