Change NetLog URL to public-facing chromium.org one

Change-Id: I01434f6ef23fcd61a6aec55ef051bb7ba46f8341
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895495
Commit-Queue: Lily Chen <chlily@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711687}

net/docs/bug-triage.md

@@ -42,7 +42,7 @@ uniform, predictable two day commitment for all triagers.
     for suspected network bugs, a network component assigned and a
     chrome://net-export/ log requested.  Suggested text: "Please collect and
     attach a chrome://net-export log. Instructions can be found here:
-    https://sites.google.com/a/chromium.org/dev/for-testers/providing-network-details".
+    https://chromium.org/for-testers/providing-network-details".
     A link to the instructions appears on net-export, for easy reference.
     When asking for a log or more details, attach the Needs-Feedback label.