doc/go1: minor corrections

        Set dagger looks very much like t in some fonts, so superscript it.
        os/signal is no longer in exp.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5720049

doc/go1.html

@@ -650,13 +650,12 @@ Several packages have moved under <code>exp</code> at the time of Go 1's release
 
 <ul>
 <li><code>ebnf</code></li>
-<li><code>html</code>&#8224;</li>
+<li><code>html</code><sup>&#8224;</sup></li>
 <li><code>go/types</code></li>
-<li><code>os/signal</code></li>
 </ul>
 
 <p>
-(&#8224;The <code>EscapeString</code> and <code>UnescapeString</code> types remain
+(<sup>&#8224;</sup>The <code>EscapeString</code> and <code>UnescapeString</code> types remain
 in package <code>html</code>.)
 </p>
 

doc/go1.tmpl

@@ -574,13 +574,12 @@ Several packages have moved under <code>exp</code> at the time of Go 1's release
 
 <ul>
 <li><code>ebnf</code></li>
-<li><code>html</code>&#8224;</li>
+<li><code>html</code><sup>&#8224;</sup></li>
 <li><code>go/types</code></li>
-<li><code>os/signal</code></li>
 </ul>
 
 <p>
-(&#8224;The <code>EscapeString</code> and <code>UnescapeString</code> types remain
+(<sup>&#8224;</sup>The <code>EscapeString</code> and <code>UnescapeString</code> types remain
 in package <code>html</code>.)
 </p>