Add sim modification functions to userguide

[lrennels]

No description provided.

[rjplevin]

Are we sure we want to export all of these? I think these functions will be used by relatively few users.

[lrennels]

@rjplevin we probably don't, you're right and I was thinking about that, but wanted to link to the docstrings in which case I needed them in the Reference.md file. I guess it would be better to unlink them in the docs and the users can look them up if they want them.

I realized in the meantime that our Reference.md file isn't building properly ...

[lrennels]

Ah I think I found the problem there looking at the v0.9.0 docs build ... it can't the new_comp doctstring

[codecov-io]

Codecov Report

Merging #501 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #501   +/-   ##
=======================================
  Coverage   80.74%   80.74%           
=======================================
  Files          26       26           
  Lines        1937     1937           
=======================================
  Hits         1564     1564           
  Misses        373      373

Impacted Files	Coverage Δ
src/Mimi.jl	100% <ø> (ø)	⬆️

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