[release-branch.go1.2] doc/install.html: fix a tag.

««« CL 30900044 / 65bf677ab8d8
doc/install.html: fix a tag.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/30900044

»»»

R=golang-dev
CC=golang-dev
https://golang.org/cl/34860044

doc/install.html

@@ -98,7 +98,7 @@ variable. You can do this by adding this line to your <code>/etc/profile</code>
 export PATH=$PATH:/usr/local/go/bin
 </pre>
 
-<h4 id="tarball_non_standard">Installing to a custom location</h3>
+<h4 id="tarball_non_standard">Installing to a custom location</h4>
 
 <p>
 The Go binary distributions assume they will be installed in