Doc: Add a link to tutorial page from `open()` doc (GH-21737)


Adds a link to the "Reading and Writing Files" page so users can
more easily discover how file handles are handled with the `with`
context manager vs without it.
(cherry picked from commit 705f14556545699ab615ec98f707b438f9603767)

Co-authored-by: Benjamin Kane <bbkane@users.noreply.github.com>
1 file changed