✏️ Renamed the startDate variable in the example code to the selectedDate to improve clarity and better reflect it's purpose

[balajis-qb]

Description

Renamed the startDate variable in the example code to the selectedDate to improve clarity and better reflect it's purpose.

Changes

• Updated variable name from startDate to selectedDate in example code.
• Ensured consistency across relevant files.

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.99%. Comparing base (386fce0) to head (5aa5985).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5501   +/-   ##
=======================================
  Coverage   96.99%   96.99%           
=======================================
  Files          30       30           
  Lines        3323     3323           
  Branches     1410     1409    -1     
=======================================
  Hits         3223     3223           
- Misses         98      100    +2     
+ Partials        2        0    -2     

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[balajis-qb]

Hi @martijnrusschen,
This PR mainly focus on improving doc-sites example code. Do you have any feedback regarding this PR?