Callr Actions: parameters now have a description

The parameters of the Callr Actions actions now have a description, in every version of every action, nested parameters included (targets[].timeout, pin.maxTries, feedback.audioFile...). So do the shared blocks (tts, audioFile, feedback, stopOnTalk, transcription, goto, defaults, compat) and the fields of the results and of the pre-defined variables.

• In the editor. The descriptions show in the Docs panel and when hovering a parameter in the Callr Actions editor of the Console.
• In the docs. The page of each action, under Actions, has a Description column in its parameter table.
• In the schema. They come from the Callr Actions schema, so any editor that reads it (VS Code with the YAML extension, for example) shows them too.
• The language of amd@v2 and amd@v3 is the language of speech recognition.

Descriptions only: no validation rule changes, and existing scenarios are not affected.