Document how pandas deals with missing values

[achals]

Signed-off-by: Achal Shah [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1748 (dc1cf1b) into master (de8a1b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1748   +/-   ##
=======================================
  Coverage   83.95%   83.95%           
=======================================
  Files          73       73           
  Lines        6003     6003           
=======================================
  Hits         5040     5040           
  Misses        963      963           

Flag	Coverage Δ
integrationtests	83.87% <ø> (ø)
unittests	64.16% <ø> (ø)

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/offline_stores/file.py	97.08% <ø> (ø)
sdk/python/feast/infra/utils/aws_utils.py	91.26% <ø> (ø)

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[achals]

/retest

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817

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[achals]

/retest