fix very minor typo shift -> unshift

[albertleigh]

This Pull Request fixes a very minor type in its rust jsArray api

It changes the following:

• just rename shift into unshift in jsarray::unshfit

[jedel1043]

Since you were talking about it nonchalantly, I thought it was a doc typo, but that's a very good bug catch! Thank you for the contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 53.75%. Comparing base (6ddc2b4) to head (fbfd57d).
Report is 327 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/object/builtins/jsarray.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4097      +/-   ##
==========================================
+ Coverage   47.24%   53.75%   +6.51%     
==========================================
  Files         476      485       +9     
  Lines       46892    48320    +1428     
==========================================
+ Hits        22154    25975    +3821     
+ Misses      24738    22345    -2393     

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[nekevss]

Oops lol nice catch! Thanks for the contribution!