Get rid of one nagging NOTE

[eddelbuettel]

Possibly brandnew and/or temporary, but all of a sudden one of the CRAN check machines now whines about missing cross refrences:

Version: 0.0.5
Check: Rd cross-references
Result: NOTE
Undeclared packages ‘tint’, ‘pinp’, ‘linl’ in Rd xrefs
Flavor: r-devel-linux-x86_64-fedora-clang

As a result the 0.0.6 currently being processed enters a 'is pending a manual inspection'. We should free ourselves and CRAN from this. It is simply due a block in the Rd file from

##'
##' @seealso Three other packages also offer RMarkdown interfaces to LaTeX
##' (or HTML) content: \code{\link[tint]{tint}} for Tufte-style pdf and html,
##' \code{\link[pinp]{pinp}} for two-column pdf vignettes, and
##' \code{\link[linl]{linl}} for LaTeX letters.
##'

and I suggest we just nix it and remove it. Screw See also. Or maybe change \code{\link[xxx]{xxx}} to just \code{xxx} for the three packages?

Thoughts? Preferences?