Add example for --skip-list in the help output

[mtausig]

Summary

The --skip-list flag allows one to exclude certain rules via a command line switch, instead of using a configuration file.

Issue Type

• Bug Report

OS / ENVIRONMENT

$ ansible-lint --version
ansible-lint 6.11.0 using ansible 2.13.7

• OS: Ubuntu 20.04
• ansible installation method: pip
• ansible-lint installation method: pip

STEPS TO REPRODUCE

Starting ansible-lint with the --help switch shows the option to exclude certain rules

$ ansible-lint --help
...
-x SKIP_LIST, --skip-list SKIP_LIST
                        only check rules whose id/tags do not match these values
...

The format of the SKIP_LIST to be used is unfortunately not obvious if multiple values are to be used. It took me a while to discover the documentation of the correct format.
Other obvious formats, like putting the values in single or double ticks do not work.

Desired Behavior

Add a short example to the help output, e.g.,

$ ansible-lint --help
...
-x SKIP_LIST, --skip-list SKIP_LIST
                       e.g., --skip-list rule1,rule2
                        only check rules whose id/tags do not match these values
...

Actual Behavior

There is no example for using --skip-list with multiple values in the help output or the man page.