document deprecated variables and outputs feature

[DanielMSchmidt]

What

Documented new deprecated field on output and variables and ignore_nested_deprecations on module calls.

• content/terraform/v1.15.x (alpha)/docs/language/block/module.mdx
• content/terraform/v1.15.x (alpha)/docs/language/block/output.mdx
• content/terraform/v1.15.x (alpha)/docs/language/block/variable.mdx

Why

We are about to add support for deprecating variables and outputs. Not yet merged, therefore this is a draft, but I wanted to get the documentation out of the way.

Screenshots

PRs

• #38082 deprecation: limit deep unmarking for better performance
• #38077 add deprecation marks to resources based on schema
• #38052 add extra origin information for deprecation diagnostics
• #38001 variable and output deprecation
• #38000 Add deprecation surpression tracking
• #37999 add deprecation marks

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