Adds docstrings for pod task

[SmritiSatyanV]

Fixes: flyteorg/flyte#2813
Adds docstrings for pod task
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Generated doc: https://flyte--1153.org.readthedocs.build/projects/flytekit/en/1153/plugins/generated/flytekitplugins.pod.Pod.html
Signed-off-by: SmritiSatyanV [email protected]

[codecov]

Codecov Report

Merging #1153 (529b5d0) into master (46a6129) will increase coverage by 0.07%.
The diff coverage is n/a.

❗ Current head 529b5d0 differs from pull request most recent head 61f0a7e. Consider uploading reports for the commit 61f0a7e to get more accurate results

@@            Coverage Diff             @@
##           master    #1153      +/-   ##
==========================================
+ Coverage   68.43%   68.51%   +0.07%     
==========================================
  Files         288      288              
  Lines       26032    26085      +53     
  Branches     2915     2918       +3     
==========================================
+ Hits        17816    17871      +55     
+ Misses       7736     7735       -1     
+ Partials      480      479       -1     

Impacted Files	Coverage Δ
flytekit/tools/repo.py	73.68% <0.00%> (ø)
flytekit/tools/fast_registration.py	89.06% <0.00%> (ø)
...ests/flytekit/unit/tools/test_fast_registration.py	100.00% <0.00%> (ø)
tests/flytekit/unit/core/test_type_engine.py	98.39% <0.00%> (+<0.01%)	⬆️
flytekit/core/type_engine.py	59.34% <0.00%> (+0.09%)	⬆️
flytekit/clis/sdk_in_container/package.py	96.29% <0.00%> (+0.14%)	⬆️
tests/flytekit/unit/cli/pyflyte/test_run.py	99.20% <0.00%> (+0.32%)	⬆️
flytekit/clis/sdk_in_container/register.py	80.76% <0.00%> (+0.37%)	⬆️
flytekit/clis/sdk_in_container/run.py	84.19% <0.00%> (+0.59%)	⬆️
flytekit/clis/sdk_in_container/serialize.py	57.14% <0.00%> (+0.62%)	⬆️

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