Correct doxygen for Mail::get

[evedon]

Summary of changes

Corrected doxygen for Mail::get.

Impact of changes

Fixes ARMmbed/mbed-os-5-docs/issues/1234

Migration actions required

N/A

Documentation

N/A

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Pull request type

[X] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[X] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@evedon, thank you for your changes.
@ARMmbed/mbed-os-core @ARMmbed/mbed-os-maintainers please review.

[adbridge]

@evedon how have you verified that this does indeed fix the Doxygen errors ?

[adbridge]

CI started

[evedon]

@evedon how have you verified that this does indeed fix the Doxygen errors ?

I haven't run doxygen. What was wrong was the content not the rendering.

[evedon]

CI Issue is unrelated to the documentation change.

[mbed-ci]

Test run: FAILED

Summary: 1 of 7 test jobs failed
Build number : 1
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_cloud-client-pytest

[0xc0170]

Client restarted