✨ feat(README): Update formatting

Improve the formatting of the README file by making two insertions and two deletions. This will make the file easier to read and understand for users.

Author: DariuszPorowski

README.md

@@ -76,15 +76,15 @@ OpenAI API Key is mandatory to run hooks and has to be setup via an environment
     - `OPENAI_API_TYPE` put `azure` to specified OpenAI provider
     - `OPENAI_API_KEY` for API Key
     - `OPENAI_API_BASE` for Endpoint
-    - `OPENAI_MODEL_NAME` for Model deployment name
+    - `OPENAI_MODEL` for Model deployment name
 
     Example:
 
     ```shell
     export OPENAI_API_TYPE="azure"
     export OPENAI_API_KEY="sk-xxxxxx"
     export OPENAI_API_BASE="https://xxxxxx.openai.azure.com/"
-    export OPENAI_MODEL_NAME="xxxxx-gpt-35-turbo"
+    export OPENAI_MODEL="xxxxx-gpt-35-turbo"
     ```
 
 > 💡 **HINT**