Fix grammar and links in VM section.

Author: msporny

index.html

@@ -1188,10 +1188,9 @@ <h2>Verification Methods</h2>
 and that references exactly one [=verification method=] type. 
 This specification defines two
 [=verification method=] types (<a href="#multikey">`Multikey`</a> and
-<a href="#jsonwebkey">`JsonWebKey`</a>); others may be defined by the community.
+<a href="#jsonwebkey">`JsonWebKey`</a>); others might be defined by the community.
 To maximize global interoperability, such community-defined [=verification method=]
-types SHOULD be registered in the Data Integrity Specification Registries
-[TBD -- DIS-REGISTRIES]. 
+types SHOULD be registered in the [[[VC-SPECS]]] [[[?VC-SPECS]]]. 
                 </dd>
                 <dt><span id="defn-controller">controller</span></dt>
                 <dd>