Fix docstrings to re-generate API docs

[aguschin]

this is done in pair with iterative/mlem.ai#197

[codecov]

Codecov Report

Base: 87.62% // Head: 86.83% // Decreases project coverage by -0.79% ⚠️

Coverage data is based on head (0dbf033) compared to base (d60f3cf).
Patch coverage: 73.16% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.3.0     #443      +/-   ##
=================================================
- Coverage          87.62%   86.83%   -0.80%     
=================================================
  Files                 94       94              
  Lines               7847     7732     -115     
=================================================
- Hits                6876     6714     -162     
- Misses               971     1018      +47     

Impacted Files	Coverage Δ
mlem/api/__init__.py	100.00% <ø> (ø)
mlem/cli/apply.py	94.23% <ø> (ø)
mlem/cli/build.py	100.00% <ø> (ø)
mlem/cli/checkenv.py	100.00% <ø> (ø)
mlem/cli/clone.py	100.00% <ø> (ø)
mlem/cli/dev.py	50.00% <ø> (ø)
mlem/cli/import_object.py	100.00% <ø> (ø)
mlem/cli/init.py	100.00% <ø> (ø)
mlem/cli/link.py	100.00% <ø> (ø)
mlem/cli/serve.py	89.47% <ø> (ø)
... and 69 more

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