Standardized formatting of CLI reference commands

Command name should be a H1

Only Description, Examples, and Related Commands should be H2

Changed 'Related information' heading to 'Related commands' since 99% it is only linking commands

Added some examples where relevant

Signed-off-by: Misty Stanley-Jones <misty@docker.com>
(cherry picked from commit 52df69f00d)

docs/reference/commandline/stack_rm.md

@@ -27,10 +27,12 @@ Options:
       --help   Print usage
 ```
 
+## Description
+
 Remove the stack from the swarm. This command has to be run targeting
 a manager node.
 
-## Related information
+## Related commands
 
 * [stack deploy](stack_deploy.md)
 * [stack ls](stack_ls.md)