update submitting patches docs to be a bit more true (pyca#5407)

reaperhulk · web-flow · commit 872835ea0ded · 2020-08-16T15:23:02.000-04:00
For now best practice is that they should be optional.
diff --git a/docs/development/submitting-patches.rst b/docs/development/submitting-patches.rst
@@ -81,10 +81,9 @@ Every recipe should include a version or algorithmic marker of some sort in its
 output in order to allow transparent upgrading of the algorithms in use, as
 the algorithms or parameters needed to achieve a given security margin evolve.
 
-APIs at the :doc:`/hazmat/primitives/index` layer should always take an
-explicit backend, APIs at the recipes layer should automatically use the
-:func:`~cryptography.hazmat.backends.default_backend`, but optionally allow
-specifying a different backend.
+APIs at the :doc:`/hazmat/primitives/index` and recipes layer should
+automatically use the :func:`~cryptography.hazmat.backends.default_backend`,
+but optionally allow specifying a different backend.
 
 C bindings
 ~~~~~~~~~~
