Correct Javadoc return description for cylinder surface area

[vardhan30016]

Description

Fixed incorrect Javadoc return description for the surfaceAreaCylinder method.

Changes

• Changed @return volume of given cylinder to @return surface area of given cylinder

The method calculates surface area, not volume, so the javadoc was misleading.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.51%. Comparing base (a14e1e3) to head (88f180b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7140   +/-   ##
=========================================
  Coverage     78.51%   78.51%           
  Complexity     6752     6752           
=========================================
  Files           759      759           
  Lines         22402    22402           
  Branches       4400     4400           
=========================================
  Hits          17589    17589           
  Misses         4108     4108           
  Partials        705      705           

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