fix: suggest PyPA build instead of pep517.build

docs/setuptools.rst

@@ -157,7 +157,7 @@ To use this feature:
       ]
       build-backend = "setuptools.build_meta"
 
-* Use a :pep:`517` compatible build frontend, such as ``pip >= 19`` or ``pep517``.
+* Use a :pep:`517` compatible build frontend, such as ``pip >= 19`` or ``build``.
 
   .. warning::