docs: some tweaks to cli help

src/cli/index.js

@@ -270,6 +270,7 @@ program
 		console.log(`\n${[
 			'When running particular upgrade scripts, options are ignored.',
 			'By default all options are enabled. Passing any options disables that default.',
+			'\nExamples:',
 			`  Only package and dependency updates: ${chalk.yellow('./nodebb upgrade -mi')}`,
 			`  Only database update: ${chalk.yellow('./nodebb upgrade -s')}`,
 		].join('\n')}`);