Combine request/response tampering into single threat definition

Merge the nearly identical Request Tampering and Response Tampering
definitions into a single Protocol Tampering definition.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: marcoscaceres

index.html

@@ -1590,23 +1590,14 @@ <h4>
       </p>
       <dl>
         <dt>
-          <dfn>Request Tampering</dfn>
+          <dfn>Data Tampering</dfn>
         </dt>
         <dd>
           Modification of a [=digital credential/presentation protocol=] or
-          [=digital credential/issuance protocol=] request after it is created.
-          This threat is expected to be addressed by the underlying exchange
-          protocol; for example, through signing and validating requests.
-        </dd>
-        <dt>
-          <dfn>Response Tampering</dfn>
-        </dt>
-        <dd>
-          Modification of a [=digital credential/presentation protocol=] or
-          [=digital credential/issuance protocol=] response after it is
-          created. This threat is expected to be addressed by the underlying
+          [=digital credential/issuance protocol=] request or response after it
+          is created. This threat is expected to be addressed by the underlying
           exchange protocol; for example, through signing and validating
-          responses.
+          requests and responses.
         </dd>
       </dl>
       <h3>
@@ -1666,8 +1657,7 @@ <h4>
         level.
       </p>
       <p>
-        These mechanisms reduce [=request tampering=] and [=response
-        tampering=] at the protocol level.
+        These mechanisms reduce [=data tampering=] at the protocol level.
       </p>
     </section>
     <section class="informative" data-cite="privacy-principles">