Fix syntax errors in HTML.

Author: msporny

index.html

@@ -1154,8 +1154,8 @@ <h2>Resource Integrity</h2>
 cryptographic digest. For example, the [[[VC-DATA-MODEL-2.0]]] refers to
 context (`https://www.w3.org/ns/credentials/v2`) which includes
 `digestMultibase`, and the [[[VC-DATA-MODEL-2.0]]] includes
-<data cite="VC-DATA-MODEL-2.0/#base-context">the hexadecimal encoded
-SHA2-256 digest value</data> of that context document.
+<a data-cite="VC-DATA-MODEL-2.0#base-context">the hexadecimal encoded
+SHA2-256 digest value</a> of that context document.
         </p>
 
         <p>
@@ -2221,7 +2221,7 @@ <h3>Processing Errors</h3>
           <dd>
 An error was encountered during proof verification. See Section [[[#verify-proof]]].
           </dd>
-          <dt id="PROOF_TRANSFORMATION_ERROR ">PROOF_TRANSFORMATION_ERROR  (-18)</dt>
+          <dt id="PROOF_TRANSFORMATION_ERROR">PROOF_TRANSFORMATION_ERROR  (-18)</dt>
           <dd>
 An error was encountered during the transformation process.
           </dd>