Documentation suggestions

[amirkx]

Hi
I was looking through the documentation and saw some inconsistency and tried to fix it.

The things i changed are as follows:

1. "envfile" -> ".env file"
2. a .env file -> an .enf file
3. This is useful when you are creating artifacts that need to contain secrets stored in Github secretes.
   This is useful when you are creating artifacts that contain values stored in Github secretes.

Hope you find it useful.

[AngelOnFira]

Thanks for the changes!