fix: fix gnuplot command was not exported (#2474)

fix: fix gnuplot command was not exported

Author: aminya

examples/gnuplot.gp

@@ -0,0 +1,14 @@
+reset
+set term pdfcairo color dashed enhanced size 15 cm, 10 cm
+
+set output "gnuplot.pdf"
+
+set key noauto bottom
+set xlabel "x"
+set ylabel "f(x)"
+
+f(x) = x/(1 + x)
+
+plot f(x) w l lw 2
+
+set output

lib/grammars/doc.js

@@ -103,6 +103,7 @@ const SCSS = Sass
 const Docs = {
   DOT,
   GNUPlot: gnuplot,
+  gnuplot,
   "Graphviz (DOT)": Graphviz,
   HTML,
   LaTeX,