Add title and change spelling for use of approx with non-numerics

src/_pytest/python_api.py

@@ -632,8 +632,10 @@ def approx(expected, rel=None, abs=None, nan_ok: bool = False) -> ApproxBase:
  >>> 1 + 1e-8 == approx(1, rel=1e-6, abs=1e-12)
  True
 
- You can also use ``approx`` to compare nonnumeric types, or dicts and
- sequences containing nonnumeric types, in which case it falls back to
+ **Non-numeric types**
+
+ You can also use ``approx`` to compare non-numeric types, or dicts and
+ sequences containing non-numeric types, in which case it falls back to
  strict equality. This can be useful for comparing dicts and sequences that
  can contain optional values::
 
@@ -708,10 +710,10 @@ def approx(expected, rel=None, abs=None, nan_ok: bool = False) -> ApproxBase:
 
  .. versionchanged:: 3.7.1
  ``approx`` raises ``TypeError`` when it encounters a dict value or
- sequence element of nonnumeric type.
+ sequence element of non-numeric type.
 
  .. versionchanged:: 6.1.0
- ``approx`` falls back to strict equality for nonnumeric types instead
+ ``approx`` falls back to strict equality for non-numeric types instead
  of raising ``TypeError``.
  """
  # Delegate the comparison to a class that knows how to deal with the type

testing/python/approx.py

@@ -939,7 +939,7 @@ def test_nonnumeric_okay_if_equal(self, x):
  ],
  )
  def test_nonnumeric_false_if_unequal(self, x):
- """For nonnumeric types, x != pytest.approx(y) reduces to x != y"""
+ """For non-numeric types, x != pytest.approx(y) reduces to x != y"""
  assert "ab" != approx("abc")
  assert ["ab"] != approx(["abc"])
  # in particular, both of these should return False