fix typos in markdown files

[8bit-pixies]

What this PR does / why we need it:

Fixes typos in docs

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2289 (01038da) into master (3b36334) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2289      +/-   ##
==========================================
- Coverage   58.60%   58.55%   -0.05%     
==========================================
  Files         116      116              
  Lines        9810     9820      +10     
==========================================
+ Hits         5749     5750       +1     
- Misses       4061     4070       +9     

Flag	Coverage Δ
unittests	58.55% <ø> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
...ts/integration/feature_repos/repo_configuration.py	44.44% <0.00%> (-0.93%)	⬇️
...s/integration/registration/test_universal_types.py	34.75% <0.00%> (-0.43%)	⬇️
sdk/python/feast/type_map.py	40.12% <0.00%> (ø)
.../integration/online_store/test_universal_online.py	15.32% <0.00%> (+0.32%)	⬆️

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[felixwang9817]

hey @charliec443 thanks for this PR! you'll have to sign your commits with git commit -s to pass the DCO check

[chapman73]

Thanks @felixwang9817 should be done now

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: charliec443, woop

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[woop]

Thanks @charliec443