fix: displaydoc

[JonathanWoollett-Light]

Changes

Uses displaydoc to derive error messages from doc comments to reduce duplication.

Reason

See above.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license. For more information on following
Developer Certificate of Origin and signing off your commits, please check
CONTRIBUTING.md.

PR Checklist

• If a specific issue led to this PR, this PR closes the issue.
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• API changes follow the Runbook for Firecracker API changes.
• User-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.
• New TODOs link to an issue.
• Commits meet contribution quality standards.

---

• This functionality cannot be added in rust-vmm.

[codecov]

Codecov Report

Patch coverage: 45.63% and no project coverage change.

Comparison is base (8460464) 82.27% compared to head (ebf7b3b) 82.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4113   +/-   ##
=======================================
  Coverage   82.27%   82.27%           
=======================================
  Files         225      225           
  Lines       28470    28470           
=======================================
  Hits        23423    23423           
  Misses       5047     5047           

Flag	Coverage Δ
4.14-c7g.metal	77.70% <50.64%> (ø)
4.14-m5d.metal	79.57% <45.65%> (ø)
4.14-m6a.metal	78.69% <44.68%> (ø)
4.14-m6g.metal	77.70% <50.64%> (ø)
4.14-m6i.metal	79.57% <45.65%> (ø)
5.10-c7g.metal	80.61% <50.64%> (ø)
5.10-m5d.metal	82.25% <45.65%> (ø)
5.10-m6a.metal	81.46% <44.68%> (ø)
5.10-m6g.metal	80.61% <50.64%> (ø)
5.10-m6i.metal	82.24% <45.65%> (ø)
6.1-c7g.metal	80.61% <50.64%> (ø)
6.1-m5d.metal	82.25% <45.65%> (ø)
6.1-m6a.metal	81.46% <44.68%> (ø)
6.1-m6g.metal	80.61% <50.64%> (ø)
6.1-m6i.metal	82.24% <45.65%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/cpu-template-helper/src/fingerprint/compare.rs	74.50% <0.00%> (ø)
src/cpu-template-helper/src/fingerprint/dump.rs	92.98% <0.00%> (ø)
src/cpu-template-helper/src/main.rs	76.38% <0.00%> (ø)
src/cpu-template-helper/src/template/dump/mod.rs	80.00% <0.00%> (ø)
src/cpu-template-helper/src/template/strip/mod.rs	97.43% <0.00%> (ø)
src/cpu-template-helper/src/utils/mod.rs	98.03% <0.00%> (ø)
src/firecracker/src/api_server_adapter.rs	0.00% <0.00%> (ø)
src/firecracker/src/main.rs	0.21% <0.00%> (ø)
src/firecracker/src/seccomp.rs	77.77% <0.00%> (ø)
src/rebase-snap/src/main.rs	61.95% <0.00%> (ø)
... and 60 more

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