docs(useMultipleSelection): remove itemToString prop references

[SAY-5]

Pull Request

What

Removes the itemToString prop entry and TOC link from the useMultipleSelection README. The prop was removed from the hook in v9, but the docs still describe it.

Why

Per @silviuaavram in #1655 ("Thanks!"), the docs should reflect that itemToString is no longer a useMultipleSelection prop.

How

Deleted the ### itemToString section and its TOC entry. The reference inside the getA11yStatusMessage example is preserved since the surrounding comment already notes itemToString is a user-defined function in that scope.

Changes

• src/hooks/useMultipleSelection/README.md: remove itemToString section + TOC link.

Checklist

• Documentation
• Tests N/A
• TypeScript Types N/A
• Ready to be merged

Closes #1655

[silviuaavram]

Cool thanks! As a side node, we deprecated useMultipleSelection, so feel free to check useTagGroup instead in order to build multiple selection.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (74ce0f5) to head (d5e82d5).
⚠️ Report is 21 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##            master     #1684    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           18        54    +36     
  Lines         1726      1983   +257     
  Branches       518       604    +86     
==========================================
+ Hits          1726      1983   +257     

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