[cpp.replace] Remove extraneous \br

Author: tkoeppe

source/preprocessor.tex

@@ -685,13 +685,11 @@
 
 \pnum
 A preprocessing directive of the form
-
 \begin{ncsimplebnf}
 \terminal{\# define} identifier lparen identifier-list\opt{} \terminal{)} replacement-list new-line\br
 \terminal{\# define} identifier lparen \terminal{...} \terminal{)} replacement-list new-line\br
-\terminal{\# define} identifier lparen identifier-list \terminal{, ...} \terminal{)} replacement-list new-line\br
+\terminal{\# define} identifier lparen identifier-list \terminal{, ...} \terminal{)} replacement-list new-line
 \end{ncsimplebnf}
-
 \indextext{macro!function-like}%
 defines a \defn{function-like macro}
 with parameters, whose use is