d2: update page

[kant]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[kbdharun]

Thanks for your contribution, we already display the placeholder options for both the outputs at the current {{path/to/output_file.svg|path/to/output_file.[svg|png]}} example, so the current addition would make it redundant with the existing placeholder.

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Edit. just now noticed #12742, will update my suggestion for it.

Re-doing the review with updated suggestions (referring to the other PR)