Minor updates to fixtures docs (#10724)

Updated the c fixture to be a little more consistent with other fixtures in the corresponding image. for example both e and g both have edges connected with the fixtures that they explicitly depend on.

Author: billykern

doc/en/example/fixtures/test_fixtures_order_dependencies.py

@@ -17,7 +17,7 @@ def b(a, order):
 
 
 @pytest.fixture
-def c(a, b, order):
+def c(b, order):
     order.append("c")
 
 

doc/en/reference/fixtures.rst

@@ -335,7 +335,7 @@ For example:
 
 .. literalinclude:: /example/fixtures/test_fixtures_order_dependencies.py
 
-If we map out what depends on what, we get something that look like this:
+If we map out what depends on what, we get something that looks like this:
 
 .. image:: /example/fixtures/test_fixtures_order_dependencies.*
     :align: center