[media_Player] Document new actions/conditions

[kahrendt]

Description:

• Adds documentation for the new mute, unmute, next, previous, repeat_off, repeat_one, repeat_all, shuffle, unshuffle, group_join, and clear_playlist commands and the is_muted condition.
• Centralizes the announcement option for each media command documentation
• Adds a clear note that not all actions are supported depending on the media player component.

Related issue (if applicable): not applicable

Pull request in esphome with YAML changes (if applicable):

• [media_player] Add more commands to support Sendspin esphome#12258

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /components/_index.md when creating new documents for new components or cookbook.

New Component Images

If you are adding a new component to ESPHome, you can automatically generate a standardized black and white component name image for the documentation.

To generate a component image:

1. Comment on this pull request with the following command, replacing component_name with your component name in lower_case format with underscores (e.g., bme280, sht3x, dallas_temp):

   @esphomebot generate image component_name
   

2. The ESPHome bot will respond with a downloadable ZIP file containing the SVG image.

3. Extract the SVG file and place it in the /static/images/ folder of this repository.

4. Use the image in your component's index table entry in /components/_index.md.

Example: For a component called "DHT22 Temperature Sensor", use:

@esphomebot generate image dht22

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