Update accept_encoding=True documentation for Brotli
MODIFY
src/urllib3/util/request.py
src/urllib3/util/request.py
@@ -39,7 +39,8 @@ def make_headers(
:param accept_encoding:
Can be a boolean, list, or string.
- ``True`` translates to 'gzip,deflate'.
+ ``True`` translates to 'gzip,deflate'. If either the ``brotli`` or
+ ``brotlicffi`` package is installed 'gzip,deflate,br' is used instead.
List will get joined by comma.
String will be used as provided.

Update accept_encoding=True documentation for Brotli