Fix docstring refrences optfun and optprob

[Vaibhavdixit02]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0d26722) 5.27% compared to head (c0a239c) 26.38%.

Files	Patch %	Lines
src/scimlfunctions.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #564       +/-   ##
===========================================
+ Coverage    5.27%   26.38%   +21.10%     
===========================================
  Files          53       53               
  Lines        4058     4086       +28     
===========================================
+ Hits          214     1078      +864     
+ Misses       3844     3008      -836     

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