Docs: Low-Priority: unclear explanation for the usage of hyphens.

[SpotlightForBugs]

coolify-docs/docs/knowledge-base/docker/compose.md

Lines 172 to 176 in 922c18e

	Identifier with underscores (`_`) cannot use ports in environment variables. Use hyphens (`-`) instead to avoid this limitation.
	```
	SERVICE_URL_APPWRITE_SERVICE_3000 ❌
	SERVICE_URL_APPWRITE-SERVICE_3000 ✅

This reads like "All _ are banned" while example shows "All _ are okay but one has to be replaced with - maybe?"