Add #301 as source

Author: kjetilk

protocol.html

@@ -668,6 +668,7 @@ <h3 property="schema:name">Resource Type Heuristics</h3>
 		  <p>
 		    <span about="" id="server-ensure-consistency" rel="spec:requirement" resource="#server-ensure-consistency"><span property="spec:statement"><span rel="spec:requirementSubject" resource="spec:Server">Servers</span> <span rel="spec:requirementLevel" resource="spec:MUST">MUST</span> only accept requests where there is consistency between the path ending (<a href="#uri-slash-semantics">URI Slash Semantics</a>), any HTTP <code>Link</code> headers with <code>rel="type"</code> and the media type given in the <code>Content-Type</code> header of the request.</span></span>
 		    <span about="" id="server-reject-inconsistency" rel="spec:requirement" resource="#server-reject-inconsistency"><span property="spec:statement"><span rel="spec:requirementSubject" resource="spec:Server">Servers</span> <span rel="spec:requirementLevel" resource="spec:MUST">MUST</span> reject inconsistent requests a <code>409</code> status code.</span></span>
+		     [<a href="https://github.com/solid/specification/issues/301" rel="cito:citesAsSourceDocument">Source</a>]
 		  </p>
 
                   <div class="note" id="uri-allocation" inlist="" rel="schema:hasPart" resource="#uri-allocation">