patch(`/code *`): add better option validation for line / entity queries

[sudojunior]

Currently, it is theoretically possible to attempt selecting a range below 0.

• /code entity
  • around should be greater than 0
• /code lines
  • start and end should be greater than 1

This is currently the only check in place, checking if startLine exceeds the total line count of the file.

docs-bot/src/commands/code.ts

Lines 136 to 145 in 9bafefb

	if (startLine > lines.length) {
	return {
	ephemeral: true,
	content: [
	`**Failover:** Line selection out of bounds.`,
	`> Start Line: \`${startLine + 1}\``,
	`> Total Lines: \`${lines.length}\``
	].join('\n')
	};
	}

#50 could easily be thrown out and have an error returned instead, for which an onError method could be added.