Update vocab/security/vocabulary.yml

Co-authored-by: Ted Thibodeau Jr <[email protected]>

vocab/security/vocabulary.yml

@@ -209,7 +209,7 @@ property:
   - id: expiration
     label: Expiration time for a proof or verification method
     defined_by: https://www.w3.org/TR/vc-data-integrity/#defn-proof-expires
-    comment: This property is often expressed using `expires` as a shortened term in JSON-LD, for historical purposes; since this shortened term and its mapping to this property are in significant use in the ecosystem, this inconsistency between the short term name and the property identifier is expected.
+    comment: Historically, this property has often been expressed using `expires` as a shortened term in JSON-LD. Since this shortened term and its mapping to this property are in significant use in the ecosystem, the inconsistency between the short term name (`expires`) and the property identifier (`...#expiration`) is expected and should not trigger an error.
     domain:
       - sec:Proof
       - sec:VerificationMethod