docs(iteratee): Update docs

[mass2527]

• Added missing link for identity
• Added examples for property-value pairs and partial objects

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 7, 2024 9:25am

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.15%. Comparing base (67ea6bf) to head (06a2500).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #792   +/-   ##
=======================================
  Coverage   99.14%   99.15%           
=======================================
  Files         304      304           
  Lines        2689     2715   +26     
  Branches      786      799   +13     
=======================================
+ Hits         2666     2692   +26     
  Misses         22       22           
  Partials        1        1           

[raon0211]

Thanks!