fixed broken "compile bazel from source"  in "ubuntu" page
Closes
@@ -15,7 +15,7 @@ Install Bazel on Ubuntu using one of the following methods:
* [Use our custom APT repository (recommended)](#install-on-ubuntu)
* [Use the binary installer](#install-with-installer-ubuntu)
-* [Compile Bazel from source](#install-compile-source.md)
+* [Compile Bazel from source](install-compile-source.md)
Bazel comes with two completion scripts. After installing Bazel, you can:
