Docs: `azurerm_storage_account` mention a container named `$web` will be created if `static_website` specified

[magodo]

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Description

Update document of azurerm_storage_account to mention a container named $web will be created if static_website specified.

PR Checklist

• [x] I have followed the guidelines in our Contributing Documentation.
• [x] I have checked to ensure there aren't other open Pull Requests for the same update/change.
• [x] I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• [ ] I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
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Changes to existing Resource / Data Source

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Testing

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Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• Docs: azurerm_storage_account mention a container named $web will be created if static_website specified [GH-00000]

This is a (please select all that apply):

• [ ] Bug Fix
• [ ] New Feature (ie adding a service, resource, or data source)
• [ ] Enhancement
• [ ] Breaking Change

Related Issue(s)

Fixes #27701

[!NOTE] If this PR changes meaningfully during the course of review please update the title and description as required.