Update DevelopmentGuidelines.md

Author: nataled

docs/DevelopmentGuidelines.md

@@ -43,7 +43,7 @@ technical:
 content:
 - Discourage BFO shadow classes [#1539](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/1539)
 - Term adoption [#2330](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/2330) and [#2324](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/2324)
-- Standardized xref prefixes in ontologies [#525](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/525)
+- ***MORE DISCUSSION NEEDED*** Standardized xref prefixes in ontologies [#525](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/525)
 - ***MORE DISCUSSION NEEDED*** Referring to taxa not in NCBITaxon [#434](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/434)