scribble: add 'roman as a built-in element style

original commit: 2084f94c4728329ce6bbf0edc001c9237805e2da

pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/core.scrbl

@@ -780,7 +780,7 @@ recognized:
 
 @itemize[
 
- @item{@racket['tt], @racket['italic], @racket['bold], @racket['sf],
+ @item{@racket['tt], @racket['italic], @racket['bold], @racket['roman], @racket['sf],
        @racket['url], @racket['subscript], @racket['superscript], 
        @racket['smaller], @racket['larger] ---
        Basic styles recognized by all renders.}

pkgs/scribble-pkgs/scribble-lib/scribble/html-render.rkt

@@ -1340,6 +1340,7 @@
            [(italic) '([style "font-style: italic"])]
            [(bold) '([style "font-weight: bold"])]
            [(tt) '([class "stt"])]
+           [(roman) '([class "sroman"])]
            [(url) '([class "url"])]
            [(no-break) '([class "nobreak"])]
            [(sf) '([style "font-family: sans-serif; font-size: 80%; font-weight: bold"])]

pkgs/scribble-pkgs/scribble-lib/scribble/latex-render.rkt

@@ -392,6 +392,7 @@
                   [(url) (wrap e "Snolinkurl" 'url)]
                   [(no-break) (wrap e "mbox" tt?)]
                   [(sf) (wrap e "textsf" #f)]
+                  [(roman) (wrap e "textrm" #f)]
                   [(subscript) (wrap e "textsub" #f)]
                   [(superscript) (wrap e "textsuper" #f)]
                   [(smaller) (wrap e "Smaller" #f)]

pkgs/scribble-pkgs/scribble-lib/scribble/scribble.css

@@ -13,7 +13,7 @@
 }
 
 /* Serif: */
-.main, .refcontent, .tocview, .tocsub, i {
+.main, .refcontent, .tocview, .tocsub, .sroman, i {
   font-family: serif;
 }