Fix return tag on processSvg

[rdimascio]

The @returns line for the processSvg function was using @param

[codecov]

Codecov Report

Merging #946 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #946   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           34        34           
  Branches         3         3           
=========================================
  Hits            34        34           

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[colebemis]

Nice catch. Thank you, @rdimascio!