Fix link in CONTRIBUTING.md

Without this fix the link is not properly rendered

Closes bazelbuild#23209.

PiperOrigin-RevId: 660699867
Change-Id: I5c208c9d41aaa078a2851e980f1991e26d871ee3

Author: vhiairrassary

CONTRIBUTING.md

@@ -14,7 +14,7 @@ again.
 
 ## Patch Acceptance Process
 
-Read how to [build Bazel from source] (https://bazel.build/install/compile-source),
+Read how to [build Bazel from source](https://bazel.build/install/compile-source),
 [contribute to Bazel](https://bazel.build/contributing.html),
 the [acceptance process for your pull request](https://bazel.build/basics/patching.html),
 and the lifecycle of a Bazel [issue](https://www.bazel.build/maintaining/maintainers-guide.html#lifecycle-issue)