Clarify CF_API_KEY setup in examples (#3321)

examples/craftoria/docker-compose.yml

@@ -9,10 +9,14 @@ services:
       EULA: true
       ALLOW_FLIGHT: true
       MOD_PLATFORM: AUTO_CURSEFORGE
-      # allocate from https://console.curseforge.com/ and set in .env file
+      # Allocate API key from https://console.curseforge.com/
+      # and set in .env file making sure to double up dollar signs, such as
+      # CF_API_KEY=$$2a$$10$$....
+      # Refer to https://docker-minecraft-server.readthedocs.io/en/latest/types-and-platforms/mod-platforms/auto-curseforge/#api-key
       CF_API_KEY: ${CF_API_KEY}
       CF_SLUG: craftoria
       MEMORY: 8G
+      # TODO: replace with slugs and see if already excluded by cf-exclude-include.json
       CF_EXCLUDE_MODS: |
         737481
         363363