Simplify PPA installation for Ubuntu (#45690)

Adds the `--update` flag to automatically update the cache and the `--yes` flag to disable the Ansible repo description and skips confirmation dialog. +label: docsite_pr

docs/docsite/rst/installation_guide/intro_installation.rst

@@ -147,8 +147,7 @@ To configure the PPA on your machine and install ansible run these commands:
 
     $ sudo apt-get update
     $ sudo apt-get install software-properties-common
-    $ sudo apt-add-repository ppa:ansible/ansible
-    $ sudo apt-get update
+    $ sudo apt-add-repository --yes --update ppa:ansible/ansible
     $ sudo apt-get install ansible
 
 .. note:: On older Ubuntu distributions, "software-properties-common" is called "python-software-properties".