small doc update

Author: awinterstetter

R/PipeOpInfo.R

@@ -26,8 +26,8 @@
 #'   information about the object will be printed.
 #'
 #' @section Input and Output Channels:
-#' `PipeOpInfo` has one input channel called "input", it can take any type of input (*).
-#' `PipeOpInfo` has one output channel called "output", it can take any type of output (*).
+#' `PipeOpInfo` has one input channel called "input", it can take any type of input (`*`).
+#' `PipeOpInfo` has one output channel called "output", it can take any type of output (`*`).
 #'
 #' @section State:
 #' The `$state` is left empty (`list()`).