[docs] [issue22702] to improve documentation for join() (str method)

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


----------
assignee: docs at python -> rhettinger
nosy: +rhettinger

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22702>
_______________________________________