refactor: fixing typo in ServiceType enum

[ajumal-ashraf-dev]

Description

I have corrected the typo in the enum from "voice," to "voice".

Motivation and Context

There was an extra comma in the enum value causing the REST calls to fail and return a 404 error on requesting pricing for "voice"

Testing Details

Tested in a sample project. Does not affect other areas.

Example Output or Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[ajumal-ashraf-dev]

@dragonmantank @tommorris @cbetta @benfoxall @mheap Please review the change. Thank you.

[manchuck]

Note to me: Double check your macros when building out enums

[codecov-commenter]

Codecov Report

Merging #867 (517260c) into 3.x (12ec202) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              3.x     #867   +/-   ##
=======================================
  Coverage   83.87%   83.87%           
=======================================
  Files         121      121           
  Lines        1619     1619           
  Branches      311      311           
=======================================
  Hits         1358     1358           
  Misses        260      260           
  Partials        1        1           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more