Fix typo in feature retrieval doc

[olivierlabreche]

What this PR does / why we need it:
Fix a typo (I think) in feature retrieval doc. I am not sure why we talk about "entity timestamp" when we refer to "event timestamp" everywhere else in the paragraph.

Which issue(s) this PR fixes:
N/A

Does this PR introduce a user-facing change?:
NONE

Fix typo in feature retrieval doc

[feast-ci-bot]

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[codecov-commenter]

Codecov Report

Merging #2092 (09c866d) into master (54d0f3a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2092   +/-   ##
=======================================
  Coverage   83.44%   83.44%           
=======================================
  Files         100      100           
  Lines        8077     8077           
=======================================
  Hits         6740     6740           
  Misses       1337     1337           

Flag	Coverage Δ
integrationtests	73.87% <ø> (ø)
unittests	58.10% <ø> (ø)

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[felixwang9817]

Hey @olivierlabreche, thanks a lot for the PR! We require that all commits be signed - would you mind rebasing your changes and signing all of your commits? Thanks!

[olivierlabreche]

Hey @olivierlabreche, thanks a lot for the PR! We require that all commits be signed - would you mind rebasing your changes and signing all of your commits? Thanks!

Sign-off added. Thanks.

[olivierlabreche]

/assign @felixwang9817

[adchia]

/lgtm

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adchia, felixwang9817, olivierlabreche

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