Merge pull request #3145 from timoschilling/patch-1

fix syntax highlighting

doc/guides/compile.md

@@ -67,7 +67,7 @@ toolchain :clang
 Toolchain configuration for Visual Studio on Windows. If you use the
 [Visual Studio Command Prompt](http://msdn.microsoft.com/en-us/library/ms229859\(v=vs.110\).aspx),
 you normally do not have to specify this manually, since it gets automatically detected by our build process.
-```
+```ruby
 toolchain :visualcpp
 ```