Patch 1 (#2388)

# Description

Two small comment changes in the .env file. One to reposition the main
file comment to the top of the file and the other to add a comment to
the OpenAI config line per #2384

## Checklist before requesting a review

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [na] I have commented hard-to-understand areas

.env.example

@@ -1,14 +1,12 @@
 #### QUIVR Configuration
+# This file is used to configure the Quivr stack. It is used by the `docker-compose.yml` file to configure the stack.
 
-
+# OPENAI. Update this to use your API key. To skip OpenAI integration use a fake key, for example: tk-aabbccddAABBCCDDEeFfGgHhIiJKLmnopjklMNOPqQqQqQqQ
 OPENAI_API_KEY=CHANGE_ME 
 
-#LOCAL
+# LOCAL
 # OLLAMA_API_BASE_URL=http://host.docker.internal:11434 # Uncomment to activate ollama. This is the local url for the ollama api
 
-
-# This file is used to configure the Quivr stack. It is used by the `docker-compose.yml` file to configure the stack.
-
 ########
 # FRONTEND
 ########