Update links to point at main branch

As part of go/coil update code search links to not point to the
"master" branch.

Bug: chromium:1226942
Change-Id: I0ae9e84ecc660f789a69fe0b226f93bbc39a8a66
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226081
Commit-Queue: Tony Herre <toprice@chromium.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34531}
diff --git a/.vpython b/.vpython
index df838dc..a57f82f 100644
--- a/.vpython
+++ b/.vpython
@@ -9,7 +9,7 @@
 # CIPD (the "Chrome Infrastructure Package Deployer" service). Unlike `pip`,
 # this never requires the end-user machine to have a working python extension
 # compilation environment. All of these packages are built using:
-#   https://chromium.googlesource.com/infra/infra/+/master/infra/tools/dockerbuild/
+#   https://chromium.googlesource.com/infra/infra/+/main/infra/tools/dockerbuild/
 #
 # All python scripts in the repo share this same spec, to avoid dependency
 # fragmentation.
@@ -20,7 +20,7 @@
 #   vpython path/to/script.py some --arguments
 #
 # Read more about `vpython` and how to modify this file here:
-#   https://chromium.googlesource.com/infra/infra/+/master/doc/users/vpython.md
+#   https://chromium.googlesource.com/infra/infra/+/main/doc/users/vpython.md
 
 python_version: "2.7"