doc/faq: reword the link to the generics proposal

A late response to CL 22163.

Change-Id: I5275a22af7081875af0256da296811f4fe9832dc
Reviewed-on: https://go-review.googlesource.com/22296Reviewed-by: David Symonds <dsymonds@golang.org>

doc/go_faq.html

@@ -335,8 +335,10 @@ code that does what generics would enable, if less smoothly.
 </p>
 
 <p>
-This remains an open issue. See <a href="https://golang.org/issue/15292">the generics proposal issue</a>
-for more information.
+The topic remains open.
+For a look at several previous unsuccessful attempts to
+design a good generics solution for Go, see
+<a href="https://golang.org/issue/15292">this proposal</a>.
 </p>
 
 <h3 id="exceptions">