Update missing plugin configuration options and formatting details

[arsaboo]

Missing plugin documentation was not right. The format option does not work. Updated it to reflect the use of global album and item format.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updated the Missing plugin documentation to replace the unsupported format option with separate album_format and item_format settings, and clarified available formatting tokens and usage examples to reflect global format behavior.

File-Level Changes

Change	Details	Files
Replace deprecated format option with album_format and item_format	Removed all references to the old format config key Introduced album_format for album-level naming Introduced item_format for item-level naming Updated example configuration block to use the new options	docs/plugins/missing.rst
Clarify formatting details and token usage	Added description of global format inheritance Expanded list of supported tokens and their meanings Adjusted narrative to reflect how album and item formats interact	docs/plugins/missing.rst

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[Copilot]

Pull Request Overview

Updates the missing plugin documentation to correct inaccurate configuration details and clarify formatting behavior. The format option was incorrectly documented and has been removed in favor of using global formatting options.

• Removed incorrect format configuration option documentation
• Added new Formatting section explaining the use of global format_item and format_album options
• Updated example configuration to demonstrate proper global format usage

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[semohr]

LGTM