pandoc: adjust order and make the example what newbies would most likely use it for (#14014)

Update pandoc.md

pages/common/pandoc.md

@@ -7,14 +7,14 @@
 
 `pandoc {{input.md}} -o {{output.pdf}}`
 
+- Convert to a standalone file with the appropriate headers/footers (for LaTeX, HTML, etc.):
+
+`pandoc {{input.md}} -s -o {{output.html}}`
+
 - Force conversion to use a specific format:
 
 `pandoc {{input.docx}} --to {{gfm}} -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`