[R-sig-Fedora] New deps for R-gh

[Tom Callaway]

Hi friends,

R-gh's latest version grew a dependency on httr2 (which has a suggests for
%check on docopt), so I made two new packages for Fedora. They're both
noarch and simple, should be quick reviews for someone. Any help here is
appreciated.

R-docopt: https://bugzilla.redhat.com/show_bug.cgi?id=2176170
R-httr2: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=2176171

Thanks in advance,
~spot

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