Change link from NEP 29 to SPEC 0 for Numpy Guidelines

Author: tilovashahrin

doc/source/development/policies.rst

@@ -51,7 +51,7 @@ pandas may change the behavior of experimental features at any time.
 Python support
 ~~~~~~~~~~~~~~
 
-pandas mirrors the `NumPy guidelines for Python support <https://numpy.org/neps/nep-0029-deprecation_policy.html#implementation>`__.
+pandas mirrors the `NumPy guidelines for Python support <https://scientific-python.org/specs/spec-0000/#description>`__.
 
 Security policy
 ~~~~~~~~~~~~~~~