FIX: Typo in OS name

README_SETUP.md

@@ -34,12 +34,14 @@ packages you will ever need out of the box.  If you prefer, you may also install
 After installation, open an Anaconda prompt from the Windows menu and continue in the [Generic
 installation](#generic-installation) section.
 
-#### iOS ####
+#### MacOS ####
 
-If there is no Python 3 installed yet, there are two main ways to obtain it: Either get the binary
-package from [python.org](https://www.python.org/downloads/) or, for advanced users, install via [Homebrew](https://brew.sh/).  After installation
-from python.org, it is recommended to also update the TLS certificates for Python (this requires
-administrator rights for your user):
+If there is no Python 3 installed yet, there are two main ways to
+obtain it: Either get the binary package from
+[python.org](https://www.python.org/downloads/) or, for advanced
+users, install via [Homebrew](https://brew.sh/). After installation
+from python.org, it is recommended to also update the TLS certificates
+for Python (this requires administrator rights for your user):
 
 ```sh
 # Replace this with your Python version number:
@@ -49,7 +51,8 @@ cd /Applications/Python\ 3.9/
 sudo ./Install\ Certificates.command
 ```
 
-After these steps, you may continue with the [Generic installation](#generic-installation).
+After these steps, you may continue with the [Generic
+installation](#generic-installation).
 
 #### Generic installation ####