fix link

Signed-off-by: William Woodruff <william@astral.sh>

Author: woodruffw

peps/pep-0807.rst

@@ -99,7 +99,7 @@ Unless explicitly stated otherwise, the following constraints
 apply to all parts of this PEP's specification:
 
 * All URLs **MUST** have `potentially trustworthy origins
-  <https://www.w3.org/TR/secure-contexts/#potentially-trustworthy-origins>`__.
+  <https://www.w3.org/TR/secure-contexts/#potentially-trustworthy-origin>`__.
   In practice, this means that all URLs **MUST** use the ``https``
   scheme, be some variant of a local loopback (``localhost``,
   ``127.0.0.1``, etc.), or otherwise be considered *a priori* trustworthy