add fr footnote

Author: rickeylev

peps/pep-0796.rst

@@ -219,6 +219,7 @@ Footnotes
   A relocatable Python runtime.
 * `PoC for relative home in Python startup <https://github.com/python/cpython/compare/main...rickeylev:cpython:feat.relative.pyvenv.home>`__
 * `Python Ideas "Making venvs relocatable friendly" discussion <https://discuss.python.org/t/making-venvs-relocatable-friendly/96177>`__
+* `GH-136051: relative pyvenv.cfg home <https://github.com/python/cpython/issues/136051>`__
 
 Rejected Ideas
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