Add explanation to generate_protocol_resources
Add explanation to generate_protocol_resources

R=1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org

Bug: none
Change-Id: I186e32ee0eb323e0f068eecbb3bce6c50a1f43c9
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2894391
Commit-Queue: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Auto-Submit: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend