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

(cherry picked from commit 6887d86e9a04b9c5718b08e5d9e1ca3cc1f53721)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
diff --git a/Doc/library/glob.rst b/Doc/library/glob.rst
index a8a5a50..25bd4b7 100644
--- a/Doc/library/glob.rst
+++ b/Doc/library/glob.rst
@@ -48,7 +48,7 @@
       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.