Minor grammatical fix to lifecycle diagram.

Author: msporny

index.html

@@ -2747,7 +2747,7 @@ <h3>Lifecycle Details</h3>
          All parties can use information from a logical
          verifiable data registry. Holder may also delete credential.">
           <figcaption style="text-align: center;">
-            Life of a single Verifiable Credential: the roles and information flows for this specification.
+            Lifecycle of a single Verifiable Credential: the roles and information flows for this specification.
           </figcaption>
         </figure>