Added configuration guideline (#3309)

### What problem does this PR solve?



### Type of change


- [x] Documentation Update

docker/.env

@@ -51,12 +51,13 @@ REDIS_PASSWORD=infini_rag_flow
 SVR_HTTP_PORT=9380
 
 # The RAGFlow Docker image to download.
-# Defaults to the dev-slim edition.
+# Defaults to the dev-slim edition, which is the RAGFlow Docker image without embedding models.
 RAGFLOW_IMAGE=infiniflow/ragflow:dev-slim
 #
 # To download the RAGFlow Docker image with embedding models, uncomment the following line instead:
+# RAGFLOW_IMAGE=infiniflow/ragflow:dev
 # 
-# This Docker image includes:
+# The Docker image of the dev edition includes:
 # - Embedded embedding models:
 #   - BAAI/bge-large-zh-v1.5
 #   - BAAI/bge-reranker-v2-m3
@@ -72,7 +73,7 @@ RAGFLOW_IMAGE=infiniflow/ragflow:dev-slim
 #   - nomic-ai/nomic-embed-text-v1.5
 #   - sentence-transformers/all-MiniLM-L6-v2
 #
-# RAGFLOW_IMAGE=infiniflow/ragflow:dev
+# 
 
 
 # If you cannot download the RAGFlow Docker image:
@@ -92,5 +93,6 @@ TIMEZONE='Asia/Shanghai'
 # Uncomment the following line if you have limited access to huggingface.co:
 # HF_ENDPOINT=https://hf-mirror.com
 
+# Optimizations for MacOS
 # Uncomment the following line if your OS is MacOS:
 # MACOS=1