Fix broken link for "C++ common use cases"
Links to cpp use cases outside of tutorial directory.
Fixes  (I think?)
Closes
@@ -21,7 +21,7 @@ projects with Bazel.
The following resources will help you work with Bazel on C++ projects:
* [Tutorial: Building a C++ project](tutorial/cpp.html)
-* [C++ common use cases](tutorial/cpp-use-cases.html)
+* [C++ common use cases](cpp-use-cases.html)
* [C/C++ rules](https://docs.bazel.build/versions/master/be/c-cpp.html)
## Best practices
