docs: update hooks guide reference

Signed-off-by: Emmanuel Ferdman <[email protected]>

docs/concepts/extension_points.rst

@@ -159,7 +159,7 @@ Here are the different integration points that python plugins can use:
 .. _pluggable_override docstring: https://github.com/openedx/edx-django-utils/blob/master/edx_django_utils/plugins/pluggable_override.py
 .. _separate events library: https://github.com/eduNEXT/openedx-events/
 .. _separate filters library: https://github.com/eduNEXT/openedx-filters/
-.. _hooks guide: https://github.com/openedx/edx-platform/blob/master/docs/guides/hooks/index.rst
+.. _hooks guide: https://github.com/openedx/edx-platform/blob/master/docs/hooks/index.rst
 
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