docs: adds typeahead prop doc in overview.mdx

[2nikhiltom]

Closes #https://github.com/carbon-design-system/carbon/issues/17690

Documents typeahead prop in overview.mdx

Changelog

New

Updated typeahead storybook example's option list to better demonstrate the navigation of filtered options using the up and down arrow keys and to show filtering behaviors Documents typeahead prop in overview.mdx

Testing / Reviewing

review docs changes

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.86%. Comparing base (c1c8a8b) to head (788b58c). Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17812   +/-   ##
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  Coverage   79.86%   79.86%           
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  Files         406      406           
  Lines       14012    14012           
  Branches     4333     4385   +52     
=======================================
  Hits        11190    11190           
+ Misses       2657     2656    -1     
- Partials      165      166    +1     

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