Fix staticdocs

Without this fix, current version of staticdocs won't pull plotOutput
into the index page.

R/bootstrap.R

@@ -764,6 +764,7 @@ verbatimTextOutput <- function(outputId) {
 }
 
 
+#' @name plotOutput
 #' @rdname plotOutput
 #' @export
 imageOutput <- function(outputId, width = "100%", height="400px",

man/plotOutput.Rd

@@ -1,6 +1,6 @@
 % Generated by roxygen2: do not edit by hand
 % Please edit documentation in R/bootstrap.R
-\name{imageOutput}
+\name{plotOutput}
 \alias{imageOutput}
 \alias{plotOutput}
 \title{Create an plot or image output element}