Docs: add code-blocks to User Guide modules_intro (#75932)

docs/docsite/rst/user_guide/modules_intro.rst

@@ -5,7 +5,9 @@ Introduction to modules
 
 Modules (also referred to as "task plugins" or "library plugins") are discrete units of code that can be used from the command line or in a playbook task. Ansible executes each module, usually on the remote managed node, and collects return values. In Ansible 2.10 and later, most modules are hosted in collections.
 
-You can execute modules from the command line::
+You can execute modules from the command line.
+
+.. code-block:: shell-session
 
     ansible webservers -m service -a "name=httpd state=started"
     ansible webservers -m ping
@@ -13,12 +15,16 @@ You can execute modules from the command line::
 
 Each module supports taking arguments.  Nearly all modules take ``key=value`` arguments, space delimited.  Some modules take no arguments, and the command/shell modules simply take the string of the command you want to run.
 
-From playbooks, Ansible modules are executed in a very similar way::
+From playbooks, Ansible modules are executed in a very similar way.
+
+.. code-block:: yaml
 
     - name: reboot the servers
       command: /sbin/reboot -t now
 
-Another way to pass arguments to a module is using YAML syntax, also called 'complex args' ::
+Another way to pass arguments to a module is using YAML syntax, also called 'complex args'.
+
+.. code-block:: yaml
 
     - name: restart webserver
       service:
@@ -27,11 +33,15 @@ Another way to pass arguments to a module is using YAML syntax, also called 'com
 
 All modules return JSON format data. This means modules can be written in any programming language. Modules should be idempotent, and should avoid making any changes if they detect that the current state matches the desired final state. When used in an Ansible playbook, modules can trigger 'change events' in the form of notifying :ref:`handlers <handlers>` to run additional tasks.
 
-You can access the documentation for each module from the command line with the ansible-doc tool::
+You can access the documentation for each module from the command line with the ansible-doc tool.
+
+.. code-block:: shell-session
 
     ansible-doc yum
 
-For a list of all available modules, see the :ref:`Collection docs <list_of_collections>`, or run the following at a command prompt::
+For a list of all available modules, see the :ref:`Collection docs <list_of_collections>`, or run the following at a command prompt.
+
+.. code-block:: shell-session
 
     ansible-doc -l