[spec] satisfy ecmarkup, provide AO example

Author: ljharb

spec.emu

@@ -14,10 +14,26 @@ contributors: Your Name(s) Here
   <p>This is an algorithm:</p>
   <emu-alg>
     1. Let _proposal_ be *undefined*.
-    1. If IsAccepted(_proposal_), then
+    1. If IsAccepted(_proposal_) is *true*, then
       1. Let _stage_ be *0*<sub>ℤ</sub>.
     1. Else,
       1. Let _stage_ be *-1*<sub>ℤ</sub>.
     1. Return ? ToString(_stage_).
   </emu-alg>
 </emu-clause>
+
+<emu-clause id="sec-is-accepted" type="abstract operation">
+  <h1>
+      IsAccepted (
+        _proposal_: an ECMAScript language value
+      ): a Boolean
+  </h1>
+  <dl class="header">
+    <dt>description</dt>
+    <dd>Tells you if the proposal was accepted</dd>
+  </dl>
+  <emu-alg>
+    1. If _proposal_ is not a String, or is not accepted, return *false*.
+    1. Return *true*.
+  </emu-alg>
+</emu-clause>