chore(guides): update 25 guides (#323)

Author: fxck

apps/docs/content/guides/environment-variables.mdx

@@ -120,7 +120,7 @@ services:
       APP_KEY=generated_value
       DB_PASSWORD=secure123
 ```
-All entries become secret variables. Requires `#yamlPreprocessor=on` if using generator functions.
+All entries become secret variables. Requires `#zeropsPreprocessor=on` if using generator functions.
 
 ## envReplace -- File-Level Substitution