doc: add link to WindowsPort page from install.html

R=r
CC=golang-dev
https://golang.org/cl/3442042

doc/install.html

@@ -64,7 +64,9 @@ support for segmented stacks, and a strong goroutine implementation.
 <p>
 The compilers can target the FreeBSD, Linux, Native Client,
 and OS X (a.k.a. Darwin) operating systems.
-(A port to Microsoft Windows is in progress but incomplete.)
+(A port to Microsoft Windows is in progress but incomplete.  See the 
+<a href="http://code.google.com/p/go/wiki/WindowsPort">Windows Port</a>
+page for details.)
 The full set of supported combinations is listed in the discussion of
 <a href="#environment">environment variables</a> below.
 </p>