Document image_upload and clearable media selector options

[parkghost]

Proposed change

Documents two media selector options that home-assistant/core#180452 exposes to
YAML: image_upload and clearable.

image_upload turns the field into an upload area, so a blueprint input or an
action field that takes an image can offer "upload from this device" rather than
only browsing what is already on the server. It requires a non-empty accept,
which is why the example and the description both show it paired with accept.
clearable is documented alongside it because the upload area is only rendered
while the value is empty, so without a clear button there is no way to pick a
different image.

Targets next because the core change ships in a future release.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Allow image_upload and clearable in the media selector config core#180452
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

Documents the new media selector configuration options (image_upload and clearable) recently exposed to YAML by the related Home Assistant Core change, so blueprint inputs and service/action selectors can offer an “upload from this device” flow.

Changes:

• Adds explanatory prose and an example showing image_upload used alongside a non-empty accept filter.
• Documents the new image_upload and clearable options in the media selector configuration block.

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