d2: update page (#12799)

pages/common/d2.md

@@ -1,15 +1,16 @@
 # d2
 
 > A modern diagram scripting language that turns text to diagrams.
+> Note: the output file supports SVG and PNG file formats.
 > More information: <https://d2lang.com/tour/man>.
 
-- Compile and render a D2 source file into an SVG or PNG file:
+- Compile and render a D2 source file into an output file:
 
-`d2 {{path/to/input_file.d2}} {{path/to/output_file.svg|path/to/output_file.png}}`
+`d2 {{path/to/input_file.d2}} {{path/to/output_file.ext}}`
 
 - [w]atch live changes made to a D2 source file in the default web browser:
 
-`d2 --watch {{path/to/input_file.d2}} {{path/to/output_file.svg|path/to/output_file.png}}`
+`d2 --watch {{path/to/input_file.d2}} {{path/to/output_file.ext}}`
 
 - Format a D2 source file:
 
@@ -21,8 +22,8 @@
 
 - Use a different [t]heme for the output file (list available themes first to get the desired `theme_id`):
 
-`d2 --theme {{theme_id}} {{path/to/input_file.d2}} {{path/to/output_file.svg|path/to/output_file.png}}`
+`d2 --theme {{theme_id}} {{path/to/input_file.d2}} {{path/to/output_file.ext}}`
 
 - Make rendered diagrams look like hand [s]ketches:
 
-`d2 --sketch true {{path/to/input_file.d2}} {{path/to/output_file.svg|path/to/output_file.png}}`
+`d2 --sketch true {{path/to/input_file.d2}} {{path/to/output_file.ext}}`