[release-branch.go1.2] doc: document Go 1.2.1

Note the installation instructions change doesn't apply here,
so I had to patch this in manually instead of using release-apply.

R=minux.ma, r
CC=golang-codereviews, golang-dev
https://golang.org/cl/69860047
diff --git a/doc/devel/release.html b/doc/devel/release.html
index d31f793..5511db7 100644
--- a/doc/devel/release.html
+++ b/doc/devel/release.html
@@ -363,6 +363,12 @@
 the Go tree (and avoid writing Makefiles).
 </p>
 
+<h3 id="go1.2.minor">Minor revisions</h3>
+
+<p>
+go1.2.1 (released 2014/03/02) includes bug fixes to the <code>runtime</code>, <code>net</code>, and <code>database/sql</code> packages.
+See the <a href="https://code.google.com/p/go/source/list?name=release-branch.go1.2&r=7ada9e760ce34e78aee5b476c9621556d0fa5d31">change history</a> for details.
+</p>
 
 <h3 id="r58.minor">Minor revisions</h3>
 
diff --git a/doc/install.html b/doc/install.html
index f08c766..af4c8f3 100644
--- a/doc/install.html
+++ b/doc/install.html
@@ -76,7 +76,7 @@
 </p>
 
 <pre>
-tar -C /usr/local -xzf go1.1.linux-amd64.tar.gz
+tar -C /usr/local -xzf go1.2.1.linux-amd64.tar.gz
 </pre>
 
 <p>