[Rd] trivial typo in ?Matrix::sparse.model.matrix.Rd

[Abby Spurdle]

> "No documentation for ‘sparse.model.matrix’ in
> specified packages and libraries", but it's there after
> "library(Ecfun)".  I find that interesting, because "Matrix" does not
> appear in the Ecfun DESCRIPTION file.

Not interesting.
Note the imports and depends fields.
(Of your own packages).

> AND I don't see 'repr = ("C",
> "R", "T")' in the "sparse.model.matrix" help file I do see.

Martin's comment used future tense.