Added Documentation support for Bazel installation in Linux distros (#3441)

This Pull Request added support for Bazel installation and setup in the
contribution_tools.md file un the docs directory. It added a link to the
releases page of the bazel repository for debian/ubuntu users to
download the binary and execute the commands provided in the
documentation.

Closes #3439

docs/project/contribution_tools.md

@@ -68,6 +68,9 @@ bazel test //...:all
 > NOTE: Most LLVM 14+ installs should build Carbon. If you're having issues, see
 > [troubleshooting build issues](#troubleshooting-build-issues).
 
+> NOTE: If you don't have a `bazel` package, see
+> [Bazel's install instructions](https://bazel.build/install) for help.
+
 ### macOS
 
 ```