Missing backslash in \code{} markup (#7114)

* Add missing backslash to \code{} blocks

* Specify the \link target only once

Author: aitap

man/fctr.Rd

@@ -3,7 +3,7 @@
 \alias{factor}
 \title{Create a factor retaining original ordering}
 \description{
-  Creates a code{\link[base:factor]{factor}}.
+  Creates a \code{\link[base]{factor}}.
 
   By default, the output will have its levels in the original order, i.e., \code{levels = unique(x)}, as opposed to \code{factor}'s default where \code{levels = sort(unique(x))}.
 }
@@ -13,7 +13,7 @@ fctr(x, levels=unique(x), ..., sort=FALSE, rev=FALSE)
 \arguments{
   \item{x}{ Object to be turned into a factor. }
   \item{levels}{ Levels for the new factor; \code{unique(x)} by default. }
-  \item{\dots}{ Other arguments passed to code{\link[base:factor]{factor}}. }
+  \item{\dots}{ Other arguments passed to \code{\link[base]{factor}}. }
   \item{sort}{ Logical, default \code{FALSE}. Should \code{levels} be sorted? }
   \item{rev}{ Logical, default \code{FALSE}. Should \code{levels} be reversed? Applied \emph{after} \code{sort}. }
 }