Log Message:
Update lang/py35-html-docs to py35-html-docs-3.5.3

pkgsrc changes:
 - Switch MASTER_SITES to https://www.python.org/ftp/python/doc/${VERS}/
   Unlike previous MASTER_SITES the documentation there is not regenerated
   periodically (so it will avoid possible changes in the distfiles).

Changes (from the `Documentation' section of the Python 3.5.3 Changelog):
 - Issue #28513: Documented command-line interface of zipfile.