[PATCH] user: Add hints for macOS Catalina

[Sebastian Huber]

Use macOS throughout.  Order release hints so that the latest macOS
release comes first.
---
 user/hosts/macos.rst | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/user/hosts/macos.rst b/user/hosts/macos.rst
index d488f20..cd3c82d 100644
--- a/user/hosts/macos.rst
+++ b/user/hosts/macos.rst
@@ -4,21 +4,37 @@
 
 .. _MacOS:
 
-Apple MacOS
+Apple macOS
 ===========
 
-Apple's OS X is fully supported. You need to download and install a recent
+Apple's macOS is fully supported. You need to download and install a recent
 version of the Apple developer application Xcode. Xocde is available in the App
 Store. Make sure you install the Command Line Tools add on available for
 download within Xcode and once installed open a Terminal shell and enter the
 command ``cc`` and accept the license agreement.
 
-The normal prefix when working on OS X as a user is under your home directory.
+The normal prefix when working on macOS as a user is under your home directory.
 Prefixes of :file:`$HOME/development/rtems` or :file:`$HOME/rtems` are
 suitable.
 
 :ref:`QuickStartPrefixes` details using Prefixes to manage the installation.
 
+Catalina
+~~~~~~~~
+
+In the
+`macOS Catalina 10.15 Release Notes <https://developer.apple.com/documentation/macos_release_notes/macos_catalina_10_15_release_notes>`_
+Apple deprecated several scripting language runtimes such as Python 2.7.  See
+also
+`Xcode 11 Release Notes <https://developer.apple.com/documentation/xcode_release_notes/xcode_11_release_notes>`_.
+It is recommened to install the
+`latest Python 3 release from python.org <https://www.python.org/downloads/mac-osx/>`_.
+
+Sierra
+~~~~~~
+
+The RSB works on Sierra with the latest Xcode.
+
 .. _Mavericks:
 
 Mavericks
@@ -27,9 +43,9 @@ Mavericks
 The RSB works on Mavericks and the GNU tools can be built for RTEMS using the
 Mavericks clang LLVM tool chain. You will need to build and install a couple of
 packages to make the RSB pass the ``sb-check``. These are CVS and XZ. You can get
-these tools from a packaging tool for MacOS such as *MacPorts* or *HomeBrew*.
+these tools from a packaging tool for macOS such as *MacPorts* or *HomeBrew*.
 
-I do not use third-party packaging on MacOS and prefer to build the packages from
+I do not use third-party packaging on macOS and prefer to build the packages from
 source using a prefix of ``/usr/local``. There are good third-party packages around
 however they sometimes bring in extra dependence and that complicates my build
 environment and I want to know the minimal requirements when building
@@ -37,8 +53,3 @@ tools. The following are required:
 
 . The XZ package's home page is http://tukaani.org/xz/ and I use version
   5.0.5. XZ builds and installs cleanly.
-
-Sierra
-~~~~~~
-
-The RSB works on Sierra with the latest Xcode.
-- 
2.16.4