Improve LinearSearch documentation with example and explanation

[AbhiramSakha]

Closes #

Improved documentation for LinearSearch:

• Added explanation of algorithm
• Included example usage
• Mentioned time and space complexity

This enhances readability for beginners.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.45%. Comparing base (010c955) to head (830ee13).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7335      +/-   ##
============================================
- Coverage     79.46%   79.45%   -0.01%     
+ Complexity     7084     7082       -2     
============================================
  Files           790      790              
  Lines         23161    23161              
  Branches       4556     4556              
============================================
- Hits          18405    18403       -2     
  Misses         4022     4022              
- Partials        734      736       +2     

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[AbhiramSakha]

Codecov Report

✅ All modified and coverable lines are covered by tests. ✅ Project coverage is 79.45%. Comparing base (af1d9d1) to head (890593e).

Additional details and impacted files
☔ View full report in Codecov by Sentry. 📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

Thanks for the report! All changes are covered by tests. Please let me know if any improvements are needed.