doc: fix install.html unclosed bold tag, link to /help/

Fixes #18406

Change-Id: Ifd7342fa8de1d2cac47b9279c1f14ac127ac193c
Reviewed-on: https://go-review.googlesource.com/34666Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

doc/install.html

@@ -246,12 +246,12 @@ Then build it with the <code>go</code> tool:
 </p>
 
 <pre class="testUnix">
-$ <b>cd $HOME/go/src/hello
+$ <b>cd $HOME/go/src/hello</b>
 $ <b>go build</b>
 </pre>
 
 <pre class="testWindows" style="display: none">
-C:\&gt; <b>cd %USERPROFILE%\go\src\hello<b>
+C:\&gt; <b>cd %USERPROFILE%\go\src\hello</b>
 C:\Users\Gopher\go\src\hello&gt; <b>go build</b>
 </pre>
 
@@ -313,16 +313,10 @@ environment variables under Windows</a>.
 <h2 id="help">Getting help</h2>
 
 <p>
-For real-time help, ask the helpful gophers in <code>#go-nuts</code> on the
-<a href="http://freenode.net/">Freenode</a> IRC server.
+  For help, see the <a href="/help/">list of Go mailing lists, forums, and places to chat</a>.
 </p>
 
 <p>
-The official mailing list for discussion of the Go language is
-<a href="//groups.google.com/group/golang-nuts">Go Nuts</a>.
-</p>
-
-<p>
-Report bugs using the
-<a href="//golang.org/issue">Go issue tracker</a>.
+  Report bugs either by running “<b><code>go</code> <code>bug</code></b>”, or
+  manually at the <a href="https://golang.org/issue">Go issue tracker</a>.
 </p>