remove confusing explanation about reusing nonce in counter mode docs
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index 9520d6e..21421d1 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -89,9 +89,7 @@
never reuse a ``nonce`` with a given ``key``. Unlike
:class:`~cryptography.primitives.block.modes.CBC`,
reusing a nonce compromises the security of all data
- encrypted under the key. Specifically,
- (pt1 xor keystream) xor (pt2 xor keystream) is
- equivalent to (pt1 xor pt2).
+ encrypted under the key.
.. class:: cryptography.primitives.block.modes.OFB(initialization_vector)