fix: typos in _index.md

[joebowbeer]

Description

Fix some typos in the markdown.

Issue reference

N/A

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

N/A

[mcruzdev]

Good catch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.47%. Comparing base (d759c53) to head (7e52bd9).
Report is 124 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1293      +/-   ##
============================================
- Coverage     76.91%   75.47%   -1.44%     
- Complexity     1592     1616      +24     
============================================
  Files           145      193      +48     
  Lines          4843     5101     +258     
  Branches        562      555       -7     
============================================
+ Hits           3725     3850     +125     
- Misses          821      935     +114     
- Partials        297      316      +19     

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