[Fix] fix docstring inline code

[Z-Fran]

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Motivation

fix wrong inline code format

Modification

Please briefly describe what modification is made in this PR.

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BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 88.98% // Head: 88.98% // No change to project coverage 👍

Coverage data is based on head (cf37278) compared to base (fa8ab5d).
Patch has no changes to coverable lines.

❗ Current head cf37278 differs from pull request most recent head 8cad739. Consider uploading reports for the commit 8cad739 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #1641   +/-   ##
========================================
  Coverage    88.98%   88.98%           
========================================
  Files          400      400           
  Lines        26079    26079           
  Branches      4043     4043           
========================================
  Hits         23206    23206           
  Misses        1974     1974           
  Partials       899      899           

Flag	Coverage Δ
unittests	88.98% <ø> (ø)

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

Impacted Files	Coverage Δ
mmedit/datasets/singan_dataset.py	100.00% <ø> (ø)
mmedit/engine/hooks/iter_time_hook.py	100.00% <ø> (ø)
mmedit/engine/hooks/visualization_hook.py	91.52% <ø> (ø)
...t/engine/optimizers/multi_optimizer_constructor.py	90.47% <ø> (ø)
...t/engine/optimizers/pggan_optimizer_constructor.py	100.00% <ø> (ø)
.../engine/optimizers/singan_optimizer_constructor.py	92.85% <ø> (ø)
mmedit/engine/runner/log_processor.py	84.50% <ø> (ø)
mmedit/evaluation/evaluator.py	98.21% <ø> (ø)
mmedit/models/base_models/base_conditional_gan.py	100.00% <ø> (ø)
mmedit/models/base_models/base_gan.py	93.88% <ø> (ø)
... and 11 more

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[zengyh1900]

lgtm.