Network bug triage: increase timeout on Needs-Feedback bugs from 7 days to 30 days.

This aligns with the best practices in the "Web Platform Team Bug SLOs" document.

NOTRY=true

Change-Id: If7a1116526f581fa79182c7f287baa3c2b0d6c79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440196
Commit-Queue: Eric Roman <eroman@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812170}

net/docs/bug-triage.md

@@ -76,7 +76,7 @@ bugs](https://bugs.chromium.org/p/chromium/issues/list?sort=pri%20-modified&q=Ne
 
 * If the requested feedback was provided, review the new information and repeat
   the same steps as (1) to re-triage based on the new information.
-* If the bug had the `Needs-Feedback` label for over a week and the
+* If the bug had the `Needs-Feedback` label for over 30 days, and the
   feedback needed to make progress was not yet provided, archive the bug.
 
 ## 3. Ensure P0 and P1 bugs have an owner