[docs] tweak readme
* [Contributing](#contributing)
* [Tools](#contrib-tools)
+ * [Building Lumen](#contrib-building-lumen)
* [Project Structure](#contrib-project)
* [Making Changes](#contrib-changes)
* [About Lumen](#about)
@@ -112,7 +113,9 @@ likewise you can change the setting to use CCache by removing that option as wel
**NOTE:** Building LLVM the first time will take a long time, so grab a coffee, smoke 'em if you got 'em, etc.
-### Lumen Compiler
+<a name="contrib-building-lumen"/>
+
+### Building Lumen
Once LLVM is installed/built, you an build the `lumen` executable:
