docs: use 'recursively' in the description of rglob, and mention globs in the os equivalences (pythonGH-94954)

The r in `rglob` stands for "recursively", so use the word in the description. Also, glob and rglob can usefully be mentioned as the pathlib equivalent of os.walk.

Automerge-Triggered-By: GH:brettcannon
(cherry picked from commit 6e2fbda)

Co-authored-by: Ned Batchelder <[email protected]>

Author: nedbat

Doc/library/pathlib.rst

@@ -1107,8 +1107,8 @@ call fails (for example because the path doesn't exist).
 
 .. method:: Path.rglob(pattern)
 
-   This is like calling :func:`Path.glob` with "``**/``" added in front of the
-   given relative *pattern*::
+   Glob the given relative *pattern* recursively.  This is like calling
+   :func:`Path.glob` with "``**/``" added in front of the *pattern*::
 
       >>> sorted(Path().rglob("*.py"))
       [PosixPath('build/lib/pathlib.py'),