cmd/golangorg/testdata: tweak gopls assertions yet again

I forgot that "Gopls: Home" is not the string that appears
in the actual site. Sigh.

Updates golang/go#68977

Change-Id: Idfc0ab7412d84212aa91848aae5edcbca54444ff
Reviewed-on: https://go-review.googlesource.com/c/website/+/686820
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Commit-Queue: Alan Donovan <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: adonovan

_content/gopls/doc/index.md

@@ -1,5 +1,5 @@
 ---
-title: "Gopls: Home"
+title: "Gopls: The language server for Go"
 ---
 
 <!-- This page is a placeholder before the first watchGit cycle completes -->

cmd/golangorg/testdata/godev.txt

@@ -139,7 +139,7 @@ body contains <i>This content is part of the <a href="/wiki/">Go Wiki</a>.</i>
 # body contains Gopls: Settings
 
 GET https://tip.golang.org/gopls/
-body contains Gopls: Home
+body contains Gopls: The language server for Go
 
 GET https://tip.golang.org/gopls/settings
 body contains Gopls: Settings