docs: update functions.md in the tutorial

[rhit-chois3]

changed to correct code on line 121
from
function addV: Vector * Vector -> Vector
function addV(Vector, Vector) -> Vector

Description

Related issue/PR: # (issue/PR)

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Implementation strategy and design decisions

Include a high-level summary of the implementation strategy and list important design decisions made, if any.

Examples with steps to reproduce them

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings
• I have reviewed any generated changes to the diagrams/ folder

Open questions

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[codecov]

Codecov Report

Merging #1038 (553a369) into main (03a9b03) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1038   +/-   ##
=======================================
  Coverage   64.18%   64.18%           
=======================================
  Files          62       62           
  Lines        7954     7954           
  Branches     1802     1802           
=======================================
  Hits         5105     5105           
  Misses       2733     2733           
  Partials      116      116           

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