doc: no link from /doc/ to release notes

[rsc]

The word 'release' does not appear on the page. The release notes should be linked, even
if it is just a link to the /doc/devel/release.html overview.

[adg]

Comment 1:

https://golang.org/cl/107950043

Status changed to Started.

[adg]

Comment 2:

This issue was closed by revision d131ffe.

Status changed to Fixed.

[gopherbot]

Comment 3:

CL https://golang.org/cl/105910043 mentions this issue.

[rsc]

Comment 4:

This issue was closed by revision 53e795419d6b.