I noticed that the rfn argument of sprand was poorly documented:

1. We didn't say what its arguments should be.
2. We didn't say clearly that it defaults to rand
3. The type T argument goes in a different place if rfn is passed. Moreover, although in this case you can pass T as the last argument, it seems that it doesn't really work — if it doesn't match the return type of rfn, it is ignored! So, it seems better to leave that undocumented for now until we decide what to do with it.

See also https://github.com/JuliaLang/julia/pull/30637

Codecov Report

Merging #309 (f0d6f78) into main (5f164a0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   93.61%   93.61%           
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  Files          12       12           
  Lines        7380     7380           
=======================================
  Hits         6909     6909           
  Misses        471      471           

Impacted Files	Coverage Δ
src/sparsematrix.jl	95.37% <ø> (ø)

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