fix indentation error and wrapping in docs
diff --git a/docs/hazmat/primitives/hmac.rst b/docs/hazmat/primitives/hmac.rst
index 702df2c..aec406b 100644
--- a/docs/hazmat/primitives/hmac.rst
+++ b/docs/hazmat/primitives/hmac.rst
@@ -20,9 +20,10 @@
.. class:: cryptography.hazmat.primitives.hmac.HMAC(key, msg=None, digestmod=None)
- HMAC objects take a ``key``, a hash class derived from :class:`~cryptography.primitives.hashes.BaseHash`,
- and optional msg. The ``key`` should be randomly generated bytes and
- the length of the ``block_size`` of the hash. You must keep the ``key`` secret.
+ HMAC objects take a ``key``, a hash class derived from
+ :class:`~cryptography.primitives.hashes.BaseHash`, and optional msg. The
+ ``key`` should be randomly generated bytes and the length of the
+ ``block_size`` of the hash. You must keep the ``key`` secret.
.. doctest::