Be on brand: it's macOS (#3456)

* Be on brand: it's macOS

* line wrap
diff --git a/docs/faq.rst b/docs/faq.rst
index 4327d11..4a9fd5c 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -14,10 +14,10 @@
 
 If you prefer NaCl's design, we highly recommend `PyNaCl`_.
 
-Compiling ``cryptography`` on OS X produces a ``fatal error: 'openssl/aes.h' file not found`` error
----------------------------------------------------------------------------------------------------
+Compiling ``cryptography`` on macOS produces a ``fatal error: 'openssl/aes.h' file not found`` error
+----------------------------------------------------------------------------------------------------
 
-This happens because OS X 10.11 no longer includes a copy of OpenSSL.
+This happens because macOS 10.11 no longer includes a copy of OpenSSL.
 ``cryptography`` now provides wheels which include a statically linked copy of
 OpenSSL. You're seeing this error because your copy of pip is too old to find
 our wheel files. Upgrade your copy of pip with ``pip install -U pip`` and then