Add common options reference to wp option documentation

[Copilot]

Newcomers couldn't discover common WordPress options (e.g. blogdescription) through the CLI docs, requiring external googling to find option names.

Changes

• Adds a ## COMMON OPTIONS section to the Option_Command class docblock listing the 8 most frequently used WordPress options (siteurl, blogname, blogdescription, admin_email, default_role, timezone_string, home, blog_public) with brief descriptions
• Links to the WordPress.org Option Reference for the full list

The section surfaces at the wp help option namespace level, making it the first place a user looks.

Original prompt

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This section details on the original issue you should resolve

<issue_title>List common options and link to remaining available options</issue_title>
<issue_description>> awakekat [8:35 AM] Newbie here to WP-CLI, Just a note - I noticed that there were changes recently to the documentation to the WP-CLI. I saw there was a cut down in the click through navigation, well I liked it that way, made more sense, but I understand the change. I will make this request in the training section as well. As a newbie, I would very much like to see ALL options as examples. I am looking for a way to change the tagline by way of the CLI and it is totally not mentioned in the CLI documentation. I had to google it and find that it actually is an option: wp option update blogdescription "Something other than the WP description"

Rather than list all available options, we should list the most common and then link to the corresponding WordPress.org docs for the remainder.

This documentation should be applied to most, if not all, wp option * commands.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes List common options and link to remaining available options #16

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