_content: correct pkg.dev.go links to pkg.go.dev

Fixes golang/go#62225

Change-Id: I6de01f1176494d3c83c638333194201013e21f85
Reviewed-on: https://go-review.googlesource.com/c/website/+/522075
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Eli Bendersky <eliben@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>

_content/blog/slog.md

@@ -150,7 +150,7 @@ There is a lot more to `slog`:
   among other things.
 
 The best place to learn about all of `slog` is the [package
-documentation](https://pkg.dev.go/log/slog).
+documentation](https://pkg.go.dev/log/slog).
 
 
 ## Performance

_content/doc/articles/go_command.html

@@ -87,7 +87,7 @@ git clone https://github.com/golang/glog
 </pre>
 
 and thus the import path of the
-<a href="https://pkg.dev.go/github.com/golang/glog">glog</a>
+<a href="https://pkg.go.dev/github.com/golang/glog">glog</a>
 package is "<code>github.com/golang/glog</code>".</p>
 
 <p>These paths are on the long side, but in exchange we get an