Delete build_spec.yaml, update SECURITY.md (#326)

* Delete build_spec.yaml

* Update SECURITY.md

Author: spavlusieva

SECURITY.md

@@ -21,7 +21,7 @@ security features are welcome on GitHub Issues.
 
 Security updates will be released on a regular cadence. Many of our projects
 will typically release security fixes in conjunction with the
-[Oracle Critical Patch Update][3] program. Additional
+Oracle Critical Patch Update program. Additional
 information, including past advisories, is available on our [security alerts][4]
 page.