bpo-32860: Fix a missing asterisk in the documentation for glob.iglob() (GH-5712)

(cherry picked from commit 6887d86e)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Doc/library/glob.rst

@@ -48,7 +48,7 @@ For example, ``'[?]'`` matches the character ``'?'``.
       Support for recursive globs using "``**``".
 
 
-.. function:: iglob(pathname, recursive=False)
+.. function:: iglob(pathname, *, recursive=False)
 
    Return an :term:`iterator` which yields the same values as :func:`glob`
    without actually storing them all simultaneously.