Remove Tricium notes of cpplint

cpplint is removed from Tricium in CL:6219798. Remove the reference to
it to avoid confusion.

Bug: 393394190
Change-Id: Id816bfef3af18a6d95b655b8e1155632595b1835
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6446043
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>
Reviewed-by: Yiwei Zhang <yiwzhang@google.com>
Auto-Submit: Tommy Chiang <ototot@google.com>

README.md

@@ -73,7 +73,3 @@ https://github.com/google/styleguide/tree/gh-pages/cpplint. Unfortunately, that
 repository is not maintained any more.
 If you want to update `cpplint.py` in `depot_tools`, just upload a patch to do
 so. We will figure out a long-term strategy via issue https://crbug.com/916550.
-
-Note that the `cpplint.py` here is also used by the [Tricium
-analyzer](https://chromium.googlesource.com/infra/infra/+/HEAD/go/src/infra/tricium/functions/cpplint),
-so if the cpplint.py here changes, we should also update the copy used there.