[spec] add note about receiver convention

See #15 (comment)

index.html

@@ -2980,12 +2980,15 @@
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 <emu-clause id="sec-promise.try">
 	<h1><span class="secnum">1</span> Promise.try ( <var>callbackfn</var> )</h1>
 	<p>When the <code>try</code> method is called with argument <var>callbackfn</var>, the following steps are taken:</p>
 	<emu-alg><ol><li>Let <var>C</var> be the <emu-val>this</emu-val> value.</li><li>If <var>C</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>promiseCapability</var> be ?&nbsp;<emu-xref aoid="NewPromiseCapability"><a href="https://tc39.es/ecma262/#sec-newpromisecapability">NewPromiseCapability</a></emu-xref>(<var>C</var>).</li><li>Let <var>status</var> be <emu-xref aoid="Completion"><a href="https://tc39.es/ecma262/#sec-completion-ao">Completion</a></emu-xref>(<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call">Call</a></emu-xref>(<var>callbackfn</var>, <emu-val>undefined</emu-val>, « »)).</li><li>If <var>status</var> is an <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">abrupt completion</a></emu-xref>, then<ol><li>Perform ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call">Call</a></emu-xref>(<var>promiseCapability</var>.<var class="field">[[Reject]]</var>, <emu-val>undefined</emu-val>, « <var>status</var>.<var class="field">[[Value]]</var>&nbsp;»).</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call">Call</a></emu-xref>(<var>promiseCapability</var>.<var class="field">[[Resolve]]</var>, <emu-val>undefined</emu-val>, « <var>status</var>.<var class="field">[[Value]]</var>&nbsp;»).</li></ol></li><li>Return <var>promiseCapability</var>.<var class="field">[[Promise]]</var>.</li></ol></emu-alg>
+	<emu-note><span class="note">Note</span><div class="note-contents">
+		<p>This function expects its <emu-val>this</emu-val> value to be a <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructor</a></emu-xref> function that supports the parameter conventions of the Promise <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructor</a></emu-xref>.</p>
+	</div></emu-note>
 </emu-clause><emu-annex id="sec-copyright-and-software-license">
       <h1><span class="secnum">A</span> Copyright &amp; Software License</h1>
       

spec.emu

@@ -20,4 +20,7 @@ contributors: Jordan Harband
 			1. Perform ? Call(_promiseCapability_.[[Resolve]], *undefined*, « _status_.[[Value]] »).
 		1. Return _promiseCapability_.[[Promise]].
 	</emu-alg>
+	<emu-note>
+		<p>This function expects its *this* value to be a constructor function that supports the parameter conventions of the Promise constructor.</p>
+	</emu-note>
 </emu-clause>