document that we're not building universal wheels now (#3436)

Also updates the doing a release documentation
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 363e770..9b9e10e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,9 @@
 
 * Added support for Python 3.6.
 * Windows and macOS wheels now link against OpenSSL 1.1.0.
+* macOS wheels are no longer universal. This change significantly shrinks the
+  size of the wheels. Users on macOS 32-bit Python (if there are any) should
+  migrate to 64-bit or build their own packages.
 * Changed ASN.1 dependency from ``pyasn1`` to ``asn1crypto`` resulting in a
   general performance increase when encoding/decoding ASN.1 structures. Also,
   the ``pyasn1_modules`` test dependency is no longer required.
diff --git a/docs/doing-a-release.rst b/docs/doing-a-release.rst
index 0feb59b..8e9222e 100644
--- a/docs/doing-a-release.rst
+++ b/docs/doing-a-release.rst
@@ -13,17 +13,14 @@
 Upgrading Windows
 ~~~~~~~~~~~~~~~~~
 
-Run the ``openssl-release`` Jenkins job, then copy the resulting artifacts to
-the Windows builders and unzip them in the root of the file system.
+Run the ``openssl-release-1.1`` Jenkins job, then copy the resulting artifacts
+to the Windows builders and unzip them in the root of the file system.
 
 Upgrading OS X
 ~~~~~~~~~~~~~~
 
-``brew update`` and then ``brew upgrade openssl --universal --build-bottle`` to
-build a universal library (32-bit and 64-bit) compatible with all Intel Macs.
-This can be confirmed by using
-``lipo -info /usr/local/opt/openssl/lib/libssl.dylib`` to see the available
-architectures.
+``brew update`` and then ``brew upgrade openssl@1.1 --build-bottle`` to
+install a 64-bit only library compatible with all Intel Macs.
 
 Bumping the version number
 --------------------------