doc: Link directly to GOVERNANCE file

Author: Jan Krems

CONTRIBUTING.md

@@ -17,7 +17,7 @@ The [Node.js Code of Conduct][] applies to this repo.
 
 The nodereport project falls under the governance of the diagnostics
 working group which is documented in:
-https://github.com/nodejs/diagnostics/
+https://github.com/nodejs/diagnostics/blob/master/GOVERNANCE.md.
 
 ## Developer's Certificate of Origin 1.1
 

GOVERNANCE.md

@@ -2,4 +2,4 @@
 
 The node-inspect project falls under the governance of the diagnostics
 working group which is documented in:
-https://github.com/nodejs/diagnostics.
+https://github.com/nodejs/diagnostics/blob/master/GOVERNANCE.md.