doc[Retriever] Enhance api docs for MultiQueryRetriever (langchain-ai#25035)

Enhance api docs for `MultiQueryRetriever`:

- Complete missing parameters
- Unify parameter name

Author: ZhangShenao

libs/langchain/langchain/retrievers/multi_query.py

@@ -72,6 +72,8 @@ def from_llm(
         Args:
             retriever: retriever to query documents from
             llm: llm for query generation using DEFAULT_QUERY_PROMPT
+            prompt: The prompt which aims to generate several different versions
+                of the given user query
             include_original: Whether to include the original query in the list of
                 generated queries.
 
@@ -95,7 +97,7 @@ async def _aget_relevant_documents(
         """Get relevant documents given a user query.
 
         Args:
-            question: user query
+            query: user query
 
         Returns:
             Unique union of relevant documents from all generated queries
@@ -158,7 +160,7 @@ def _get_relevant_documents(
         """Get relevant documents given a user query.
 
         Args:
-            question: user query
+            query: user query
 
         Returns:
             Unique union of relevant documents from all generated queries