swaynag: add page

[acuteenvy]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.

[ivanbaluta]

Suggested change

	`swaynag {{[-m|--message]}} "{{error message}}"`
	`swaynag {{[-m|--message]}} "{{error_message}}"`

[acuteenvy]

The message usually contains spaces, hence the quotes. I don't think snake case is appropriate here.

[ivanbaluta]

Suggested change

	`swaynag {{[-t|--type]}} warning {{[-m|--message]}} "{{warning message}}"`
	`swaynag {{[-t|--type]}} warning {{[-m|--message]}} "{{warning_message}}"`

[ivanbaluta]

Suggested change

	`swaynag {{[-f|--font]}} "{{monospace bold 9}}" {{[-m|--message]}} "{{error message}}"`
	`swaynag {{[-f|--font]}} "{{monospace bold 9}}" {{[-m|--message]}} "{{error_message}}"`

[ivanbaluta]

Suggested change

	`TERMINAL={{terminal_executable}} swaynag {{[-b|--button]}} "{{button text}}" {{command}} {{[-m|--message]}} "{{error message}}"`
	`TERMINAL={{terminal_executable}} swaynag {{[-b|--button]}} "{{button_text}}" {{command}} {{[-m|--message]}} "{{error_message}}"`

[ivanbaluta]

Suggested change

	`swaynag {{[-B|--button-no-terminal]}} "{{button text}}" {{command}} {{[-m|--message]}} "{{error message}}"`
	`swaynag {{[-B|--button-no-terminal]}} "{{button_text}}" {{command}} {{[-m|--message]}} "{{error_message}}"`

[ivanbaluta]

Suggested change

	`swaynag {{[-e|--edge]}} bottom {{[-m|--message]}} "{{error message}}"`
	`swaynag {{[-e|--edge]}} bottom {{[-m|--message]}} "{{error_message}}"`

[ivanbaluta]

Suggested change

	`swaynag {{[-o|--output]}} {{DP-1}} {{[-m|--message]}} "{{error message}}"`
	`swaynag {{[-o|--output]}} {{DP-1}} {{[-m|--message]}} "{{error_message}}"`