Add full GitHub URL to issue #521 reference in metpo-edit.owl comment (#562)

* Initial plan

* Add full GitHub URL to issue #521 reference in metpo-edit.owl comment

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot

src/ontology/metpo-edit.owl

@@ -62,7 +62,7 @@ AnnotationAssertion(rdfs:label IAO:0000231 "has obsolescence reason")
 
 AnnotationAssertion(rdfs:label IAO:0100001 "term replaced by")
 
-# Obsolescence reason values (display labels; correct IAO code assignment for these obsolescence reasons is tracked in issue #521)
+# Obsolescence reason values (display labels; correct IAO code assignment for these obsolescence reasons is tracked in GitHub issue https://github.com/berkeleybop/metpo/issues/521)
 
 AnnotationAssertion(rdfs:label IAO:0000226 "placeholder removed")
 AnnotationAssertion(rdfs:label <http://purl.obolibrary.org/obo/OMO_0001000> "out of scope")