Correct link to OCA in PR template

Author: aosingh

.github/pull_request_template.md

@@ -1,8 +1,8 @@
 Thanks for contributing!
 
 Before submitting PRs for dbt-oracle you must have your signed *Oracle
-Contributor Agreement* accepted.  See
-https://www.oracle.com/technetwork/community/oca-486395.html
+Contributor Agreement* accepted.  See [Oracle Contributor Agreement (OCA)](https://oca.opensource.oracle.com/).
+
 
 If the problem solved is small, you may find it easier to open an Issue
 describing the problem and its cause so we can create the fix.