Improve readability in LinearSearch by using local variable

[kadambari25]

✨ Improve readability in LinearSearch implementation

Description

This PR improves the readability of the LinearSearch implementation by introducing a local variable for the current element inside the loop.

Instead of directly accessing array[i] multiple times, a variable currentElement is used, making the code cleaner and easier to understand.

Changes Made

• Introduced a local variable currentElement inside the loop
• Replaced repeated array access with the local variable
• No change in functionality

Why this is useful

• Improves readability for beginners
• Makes code easier to maintain
• Follows better coding practices

---

Checklist

• I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md)
• This pull request is all my own work -- I have not plagiarized it
• All filenames are in PascalCase
• All functions and variable names follow Java naming conventions
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations
• All new algorithms include a corresponding test class that validates their functionality
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.51%. Comparing base (13aaad2) to head (5da90c9).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
.../java/com/thealgorithms/searches/LinearSearch.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7367      +/-   ##
============================================
+ Coverage     79.46%   79.51%   +0.05%     
- Complexity     7131     7142      +11     
============================================
  Files           795      796       +1     
  Lines         23297    23359      +62     
  Branches       4587     4596       +9     
============================================
+ Hits          18513    18575      +62     
+ Misses         4047     4046       -1     
- Partials        737      738       +1     

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[kadambari25]

This change is only for readability and does not affect logic.
Test coverage remains unchanged functionally.