Update copyright headers in docs/ and styleguide/

No-Try: true
Bug: 1098010
Change-Id: Id44652c3572c46c4ec732b69473fb951749d35eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3878321
Commit-Queue: Avi Drissman <[email protected]>
Owners-Override: Avi Drissman <[email protected]>
Reviewed-by: Mark Mentovai <[email protected]>
Auto-Submit: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1043985}
diff --git a/docs/android_accessing_cpp_features_in_java.md b/docs/android_accessing_cpp_features_in_java.md
index 27eb289..00d9cbf 100644
--- a/docs/android_accessing_cpp_features_in_java.md
+++ b/docs/android_accessing_cpp_features_in_java.md
@@ -16,7 +16,7 @@
    2020" to be whatever the year is at the time of writing (as you would for any
    other file).
    ```java
-    // Copyright 2020 The Chromium Authors.
+    // Copyright 2020 The Chromium Authors
     // Use of this source code is governed by a BSD-style license that can be
     // found in the LICENSE file.
 
@@ -82,7 +82,7 @@
    would contain:
 
     ```java
-    // Copyright $YEAR The Chromium Authors.
+    // Copyright $YEAR The Chromium Authors
     // Use of this source code is governed by a BSD-style license that can be
     // found in the LICENSE file.