Mention our new arm mac llvm arm build.

Signed-off-by: Sean Young <sean@mess.org>

docs/installing.rst

@@ -105,8 +105,8 @@ Installing LLVM on Mac
 ______________________
 
 A pre-built version of llvm for intel macs, is available at
-`<https://solang.io/download/llvm11.0-mac.tar.xz>`_. If you have an arm/m1 mac,
-then you have to build your own llvm using the instructions below. After downloading,
+`<https://solang.io/download/llvm11.0-mac.tar.xz>`_ and for arm macs there is
+`<https://solang.io/download/llvm11.0-mac-arm.tar.xz>`_. After downloading,
 untar the file in a terminal and add it to your path like so:
 
 .. code-block:: bash