pandoc: add example (#2483)

pages/common/pandoc.md

@@ -2,14 +2,18 @@
 
 > Convert documents between various formats.
 
-- Convert file to pdf (the output format is automatically determined from the output file's extension):
+- Convert file to pdf (the output format is determined by file extension):
 
 `pandoc {{input.md}} -o {{output.pdf}}`
 
-- Convert a file to a specific output format (useful for when the extension alone is ambiguous):
+- Force conversion to use a specific format:
 
 `pandoc {{input.docx}} --to {{markdown_github}} -o {{output.md}}`
 
+- Convert to a standalone file with the appropriate headers/footers (for LaTeX, HTML, etc.):
+
+`pandoc {{input.md}} -s -o {{output.tex}}`
+
 - List all supported input formats:
 
 `pandoc --list-input-formats`