Document description, default and options keys for workflow_dispatch inputs

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What article on docs.github.com is affected?

https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#onworkflow_dispatchinputs

What does this PR change?

Closes #46299. The on.workflow_dispatch.inputs.<input_id> section only documented required and type. This adds a section for each of the three keys the issue calls out, all of which the example on the same page already uses and the workflow schema defines:

• description: a string description of the input parameter.
• default: the value used when the workflow is triggered manually without a value being supplied.
• options: the dropdown options for the input, only usable with type: choice.

The wording follows the schema definitions in actions/languageservices (workflow-parser/src/workflow-v1.0.json) and matches the style of the existing required and type entries. No changes to examples were needed since data/reusables/actions/workflow-dispatch-inputs-example.md already shows all three keys.

AI usage

Drafted with an AI agent (GLM, Z.ai), then reviewed by hand: each claim was checked against the issue, the workflow schema field names, and the existing entries in the file. Change verified to touch only the one file.

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18

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