Fix typo in pyproject.toml

Author: sbidoul

pyproject.toml

@@ -33,7 +33,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 test = [
-  # Building editable wheels with hatchling (which what do in our tests) requires
+  # Building editable wheels with hatchling (which is what do in our tests) requires
   # 'editables' to be installed, but it is not a direct dependency of hatchling
   # (it is provided by the get_requires_for_build_editable hook).
   # So we install it here as a test dependency.