bpo-35397: Remove deprecation and document urllib.parse.unwrap (GH-11481)

diff --git a/Doc/library/urllib.parse.rst b/Doc/library/urllib.parse.rst
index f993628..49276da 100644
--- a/Doc/library/urllib.parse.rst
+++ b/Doc/library/urllib.parse.rst
@@ -370,6 +370,13 @@
    .. versionchanged:: 3.2
       Result is a structured object rather than a simple 2-tuple.
 
+.. function:: unwrap(url)
+
+   Extract the url from a wrapped URL (that is, a string formatted as
+   ``<URL:scheme://host/path>``, ``<scheme://host/path>``, ``URL:scheme://host/path``
+   or ``scheme://host/path``). If *url* is not a wrapped URL, it is returned
+   without changes.
+
 .. _parsing-ascii-encoded-bytes:
 
 Parsing ASCII Encoded Bytes