docs: fixed CONTRIBUTING typos

[adam-stasiak]

SUMMARY

I found that I affected CONTRIBUTING Guide - wrong formatting. In this PR I fix this.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12057 (44ddfcc) into master (f79e52f) will decrease coverage by 4.74%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12057      +/-   ##
==========================================
- Coverage   65.04%   60.29%   -4.75%     
==========================================
  Files         956      911      -45     
  Lines       46851    44840    -2011     
  Branches     4562     4060     -502     
==========================================
- Hits        30475    27038    -3437     
- Misses      16204    17802    +1598     
+ Partials      172        0     -172     

Flag	Coverage Δ
cypress	53.09% <ø> (+18.10%)	⬆️
javascript	?
python	64.18% <ø> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
...set-frontend/src/views/CRUD/alert/ExecutionLog.tsx	11.76% <0.00%> (-88.24%)	⬇️
...src/dashboard/components/gridComponents/Header.jsx	10.52% <0.00%> (-86.85%)	⬇️
...rc/dashboard/components/gridComponents/Divider.jsx	13.33% <0.00%> (-86.67%)	⬇️
...ontend/src/dashboard/util/getDashboardFilterKey.ts	14.28% <0.00%> (-85.72%)	⬇️
...end/src/SqlLab/components/ExploreResultsButton.jsx	8.00% <0.00%> (-84.00%)	⬇️
...nd/src/views/CRUD/data/query/QueryPreviewModal.tsx	14.70% <0.00%> (-82.97%)	⬇️
... and 395 more

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[etr2460]

thanks for cleaning this up!