Remove wrong no-manual-edit comment

Change-Id: Id1b567b87d88d3f3c29403ad9ec0c794ab9c9fd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911794Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Jit Yao Yap <jityao@google.com>
Cr-Commit-Position: refs/heads/master@{#714512}

components/policy/proto/chrome_device_policy.proto

@@ -12,7 +12,6 @@ package enterprise_management;
 
 // Everything below this comment will be synchronized between client and server
 // repos ( go/cros-proto-sync ).
-// Please don't manually edit any lines below this comment.
 
 message DevicePolicyRefreshRateProto {
   // In milliseconds.

components/policy/proto/device_management_backend.proto

@@ -10,7 +10,6 @@ package enterprise_management;
 
 // Everything below this comment will be synchronized between client and server
 // repos ( go/cros-proto-sync ).
-// Please don't manually edit any lines below this comment.
 
 // This enum needs to be shared between DeviceRegisterRequest and
 // LicenseAvailability protos. With java_api_version 1, this means that enum

components/policy/proto/policy_common_definitions.proto

@@ -10,7 +10,6 @@ package enterprise_management;
 
 // Everything below this comment will be synchronized between client and server
 // repos ( go/cros-proto-sync ).
-// Please don't manually edit any lines below this comment.
 
 message StringList {
   repeated string entries = 1;