Clarify the meaning of session description sdp need not match

webrtc.html

@@ -1893,6 +1893,12 @@ <h2>Attributes</h2>
                 "RTCPeerConnection">pendingLocalDescription</a></code> if it is
                 not null and otherwise it MUST return <code><a data-for=
                 "RTCPeerConnection">currentLocalDescription</a></code>.</p>
+
+                <p>Note that <code>currentLocalDescription.sdp</code> and
+                <code>pendingLocalDescription.sdp</code> need not be
+                string-wise identical to the <code>description.sdp</code> value
+                passed to the corresponding
+                <a><code>setLocalDescription</code></a> call.</p>
               </dd>
               <dt><code>currentLocalDescription</code> of type <span class=
               "idlAttrType"><a>RTCSessionDescription</a></span>, readonly,
@@ -1912,9 +1918,7 @@ <h2>Attributes</h2>
                 specification set it to, complete with any local candidates
                 that have been generated by the <a>ICE Agent</a> since the
                 offer or answer was created. Prior to being set, it returns
-                null. Note that the value of
-                <code>currentLocalDescription.sdp</code> need not match the
-                value of <code>localDescription.sdp</code>.</p>
+                null.</p>
               </dd>
               <dt><code>pendingLocalDescription</code> of type <span class=
               "idlAttrType"><a>RTCSessionDescription</a></span>, readonly,
@@ -1948,6 +1952,12 @@ <h2>Attributes</h2>
                 "RTCPeerConnection">pendingRemoteDescription</a></code> if it
                 is not null and otherwise it MUST return <code><a data-for=
                 "RTCPeerConnection">currentRemoteDescription</a></code>.</p>
+
+                <p>Note that <code>currentRemoteDescription.sdp</code> and
+                <code>pendingRemoteDescription.sdp</code> need not be
+                string-wise identical to the <code>description.sdp</code> value
+                passed to the corresponding
+                <a><code>setRemoteDescription</code></a> call.</p>
               </dd>
               <dt><code>currentRemoteDescription</code> of type <span class=
               "idlAttrType"><a>RTCSessionDescription</a></span>, readonly,
@@ -1969,9 +1979,7 @@ <h2>Attributes</h2>
                 that have been supplied via <code><a data-for=
                 "RTCPeerConnection">addIceCandidate()</a></code> since the
                 offer or answer was created. Prior to being set, it returns
-                null.  Note that the value of <code>currentRemoteDescription.sdp</code>
-                need not match the value of
-                <code>remoteDescription.sdp</code>.</p>
+                null.</p>
               </dd>
               <dt><code>pendingRemoteDescription</code> of type <span class=
               "idlAttrType"><a>RTCSessionDescription</a></span>, readonly,