Fix example for mount path file reference

[georgeOsdDev]

This pull request corrects a documentation example to clarify the usage of file paths when mounting storage in container apps.

• Documentation fix:
  • Corrected the example to use consistent file names for both the sub path and mount path, ensuring clarity that the mount path should refer to a file that does not already exist in the container.

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[learn-build-service-prod]

Learn Build status updates of commit d7afbeb:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/container-apps/storage-mounts.md	✅Succeeded

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[Copilot]

Pull request overview

This PR corrects a documentation example to ensure consistency in file path naming conventions when mounting storage in container apps. The fix clarifies that the mount path should include the complete file path with extension when referring to a file.

Changes:

• Updated the mount path example to include the .txt extension, matching the format used in the sub path example

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[ttorble]

@craigshoemaker

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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