docs: add simple example and explanation to JumpSearch documentation

[prashantpiyush1111]

Added a simple example and a beginner-friendly explanation to the JumpSearch documentation.

This improves clarity and helps new contributors better understand how the algorithm works.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.49%. Comparing base (79bc620) to head (56a087d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7381      +/-   ##
============================================
- Coverage     79.50%   79.49%   -0.01%     
- Complexity     7161     7162       +1     
============================================
  Files           797      797              
  Lines         23409    23409              
  Branches       4603     4603              
============================================
- Hits          18611    18610       -1     
  Misses         4054     4054              
- Partials        744      745       +1     

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