chore: update select_llm_provider docstring to be provider-agnostic

cli/utils.py

@@ -188,8 +188,8 @@ def select_deep_thinking_agent(provider) -> str:
     return choice
 
 def select_llm_provider() -> tuple[str, str | None]:
-    """Select the OpenAI api url using interactive selection."""
-    # Define OpenAI api options with their corresponding endpoints
+    """Select the LLM provider and its API URL using interactive selection."""
+    # Define LLM provider options with their corresponding endpoints
     BASE_URLS = [
         ("OpenAI", "https://api.openai.com/v1"),
         ("Google", None),  # google-genai SDK manages its own endpoint internally