docs: add pre-configured path for volume mounts

[npepinpe]

Description

This PR documents the new pre-configured document store path which provides the right permission for container volume mounts.

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support. (add bug or support label)
• This is already available but undocumented and should be released within a week. (add available & undocumented label)
• This is on a specific schedule and the assignee will coordinate a release with the Documentation team. (create draft PR and/or add hold label)
• This is part of a scheduled alpha or minor. (add alpha or minor label)
• There is no urgency with this change (add low prio label)

PR Checklist

• The commit history of this PR is cleaned up, using {type}(scope): {description} commit message(s)

• My changes are for an upcoming minor release and are in the /docs directory (version 8.9).
• My changes are for an already released minor and are in a /versioned_docs directory.

• I added a DRI, team, or delegate as a reviewer for technical accuracy and grammar/style:
  • Engineering team review
  • Technical writer review via @camunda/tech-writers unless working with an embedded writer.

[github-actions]

👋 🤖 🤔 Hello, @christinaausley! Did you make your changes in all the right places?

These files were changed only in docs/. You might want to duplicate these changes in versioned_docs/version-8.8/.

• docs/self-managed/concepts/document-handling/configuration/docker.md
• docs/self-managed/concepts/document-handling/configuration/index.md

You may have done this intentionally, but we wanted to point it out in case you didn't. You can read more about the versioning within our docs in our documentation guidelines.

[Copilot]

Pull request overview

This PR adds documentation for a new pre-configured path /usr/local/camunda/documents that can be used for volume mounts in containerized deployments, as this path has the correct permissions for the Camunda process.

• Updates local storage configuration documentation to mention the pre-configured mount path
• Updates the Docker configuration example to use the new recommended path
• Clarifies that the new path has proper permissions for the Camunda process user

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/self-managed/concepts/document-handling/configuration/index.md	Adds a note about using /usr/local/camunda/documents for container volume mounts with proper permissions
docs/self-managed/concepts/document-handling/configuration/docker.md	Updates the table description and example to use the new recommended path /usr/local/camunda/documents

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[eppdot]

lgtm ;) just apply the copilot suggestion