docs: small update in examples

examples/langchain-chroma/README.md

@@ -36,6 +36,8 @@ pip install -r requirements.txt
 
 In this step we will create a local vector database from our document set, so later we can ask questions on it with the LLM.
 
+Note: **OPENAI_API_KEY** is not required. However the library might fail if no API_KEY is passed by, so an arbitrary string can be used.
+
 ```bash
 export OPENAI_API_BASE=http://localhost:8080/v1
 export OPENAI_API_KEY=sk-

examples/langchain-python/README.md

@@ -26,6 +26,7 @@ pip install langchain
 pip install openai
 
 export OPENAI_API_BASE=http://localhost:8080
+# Note: **OPENAI_API_KEY** is not required. However the library might fail if no API_KEY is passed by, so an arbitrary string can be used.
 export OPENAI_API_KEY=sk-
 
 python test.py

examples/query_data/README.md

@@ -35,6 +35,8 @@ docker-compose up -d --build
 
 In this step we will create a local vector database from our document set, so later we can ask questions on it with the LLM.
 
+Note: **OPENAI_API_KEY** is not required. However the library might fail if no API_KEY is passed by, so an arbitrary string can be used.
+
 ```bash
 export OPENAI_API_BASE=http://localhost:8080/v1
 export OPENAI_API_KEY=sk-