doc/faq: fix link to 2018 ISMM keynote

Fixes #27860

Change-Id: I5d7a858a8d2c97dd4deb9f98c35e71fc75fca997
Reviewed-on: https://go-review.googlesource.com/137356Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go_faq.html

@@ -2458,7 +2458,7 @@ in networked servers.
 Work continues to refine the algorithm, reduce overhead and
 latency further, and to explore new approaches.
 The 2018
-<a href="https://talks.golang.org/2018/ismmkeynote">ISMM keynote</a>
+<a href="https://blog.golang.org/ismmkeynote">ISMM keynote</a>
 by Rick Hudson of the Go team
 describes the progress so far and suggests some future approaches.
 </p>