update api key example

Author: HungKNguyen

LLM_DOC.md

@@ -12,7 +12,7 @@ Provide your API key directly:
 from nutrient_dws import NutrientClient
 
 client = NutrientClient({
-    'apiKey': 'nutr_sk_your_secret_key'
+    'apiKey': 'your_secret_key'
 })
 ```
 

README.md

@@ -64,7 +64,7 @@ Provide your API key directly:
 from nutrient_dws import NutrientClient
 
 client = NutrientClient({
-    'apiKey': 'nutr_sk_your_secret_key'
+    'apiKey': 'your_secret_key'
 })
 ```
 

pyproject.toml

@@ -10,7 +10,6 @@ where = ["src"]
 
 [tool.setuptools.package-data]
 nutrient_dws = [
-    "*.pyi",
     "py.typed",
     "../../WORKFLOW.md",
     "../../METHODS.md",