Clarify that delegation mechanism isn't specific to controller.

Co-authored-by: Dave Longley <dlongley@digitalbazaar.com>

Author: msporny

index.html

@@ -1976,7 +1976,7 @@ <h2>Capability Delegation</h2>
 
             <p>
 The `capabilityDelegation` [=verification relationship=] is used to specify a
-mechanism that might be used by the [=controller=] to delegate a cryptographic
+mechanism that might be used to delegate a cryptographic
 capability to another party. The mechanism, such as an
 <a href="https://w3c-ccg.github.io/zcap-spec/">Authorization Capability</a>
 or a <a href="https://github.com/ucan-wg/spec/blob/main/README.md">UCAN</a>, and