go_spec updates

R=r, iant
CC=golang-dev
https://golang.org/cl/921041

doc/go_spec.html

@@ -5111,9 +5111,9 @@ The following minimal alignment properties are guaranteed:
 <ul>
 	<li><span class="alert">Implementation does not honor the restriction on goto statements and targets (no intervening declarations).</span></li>
 	<li><span class="alert">Method expressions are partially implemented.</span></li>
-	<li><span class="alert">Gccgo allows only one init() function per source file.</span></li>
-	<li><span class="alert">Deferred functions cannot access the surrounding function's result parameters.</span></li>
-	<li><span class="alert">Function results are not addressable in gccgo.</span></li>
-	<li><span class="alert">Recover is not implemented.</span></li>
-	<li><span class="alert">The implemented version of panic differs from its specification.</span></li>
+	<li><span class="alert">Gccgo: allows only one init() function per source file.</span></li>
+	<li><span class="alert">Gccgo: Deferred functions cannot access the surrounding function's result parameters.</span></li>
+	<li><span class="alert">Gccgo: Function results are not addressable.</span></li>
+	<li><span class="alert">Gccgo: Recover is not implemented.</span></li>
+	<li><span class="alert">Gccgo: The implemented version of panic differs from its specification.</span></li>
 </ul>