refactor: Enhance docs, fix & add tests in `GenericHashMapUsingArrayL…

[Hardvan]

…ist`

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.37%. Comparing base (f5bc2c8) to head (d7d03f6).

Files with missing lines	Patch %	Lines
.../hashmap/hashing/GenericHashMapUsingArrayList.java	90.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5973      +/-   ##
============================================
+ Coverage     71.19%   71.37%   +0.17%     
- Complexity     4897     4909      +12     
============================================
  Files           650      650              
  Lines         17533    17536       +3     
  Branches       3378     3380       +2     
============================================
+ Hits          12483    12516      +33     
+ Misses         4581     4553      -28     
+ Partials        469      467       -2     

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