fix url in contributing.rst (pydata#8683)

Author: maawoo

doc/contributing.rst

@@ -153,7 +153,7 @@ Creating a development environment
 ----------------------------------
 
 To test out code changes locally, you'll need to build *xarray* from source, which requires you to
-`create a local development environment <https://docs.xarray.dev/en/stable/contributing.html#creating-a-development-environment>`_.
+`create a local development environment <https://docs.xarray.dev/en/stable/contributing.html#contributing-dev-env>`_.
 
 Update the ``main`` branch
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