refactor: fix typo

[alxkm]

Fix few typos in GaussLegendre and Isomorphic classes, and removing redundant generics parameters.

• I have read 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 code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 46.25%. Comparing base (ce4eb55) to head (8a56d50).

Files	Patch %	Lines
...ain/java/com/thealgorithms/strings/Isomorphic.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5372      +/-   ##
============================================
- Coverage     46.26%   46.25%   -0.02%     
+ Complexity     2866     2865       -1     
============================================
  Files           525      525              
  Lines         15410    15410              
  Branches       2916     2916              
============================================
- Hits           7130     7128       -2     
- Misses         7981     7982       +1     
- Partials        299      300       +1     

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