Improve extension description

Author: Pascal Berger

src/GitVersionTfsTask/overview.md

@@ -1,6 +1,8 @@
-Versioning when using git, solved. GitVersion looks at your git history and works out the semantic version (semver.org) of the commit being built.
+Versioning when using Git, solved. GitVersion looks at your Git history and works out the [semantic version](http://semver.org) of the commit being built.
 
-It works with most branching strategies but has been designed mainly around GitFlow and GitHubFlow (pull request workflow). The calculated version numbers can then be accessed through variables such as `$(GitVersion_NuGetVersion)` and `$(GitVersion_SemVer)`. It is also very configurable to allow it to work with most release workflows!
+It works with most branching strategies but has been designed mainly around GitFlow and GitHubFlow (pull request workflow). 
+The calculated version numbers can then be accessed through variables such as `$(GitVersion_NuGetVersion)` and `$(GitVersion_SemVer)`. 
+It is also very configurable to allow it to work with most release workflows!
 
 ![Build task](img/build-task.png)