[Community]: Fixed DDG DuckDuckGoSearchResults Docstring (#22968)

- **Description:** A very small fix in the Docstring of
`DuckDuckGoSearchResults` identified in the following issue.
- **Issue:** #22961

---------

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

libs/community/langchain_community/tools/ddg_search/tool.py

@@ -40,13 +40,14 @@ class DuckDuckGoSearchRun(BaseTool):
 
 
 class DuckDuckGoSearchResults(BaseTool):
-    """Tool that queries the DuckDuckGo search API and gets back json."""
+    """Tool that queries the DuckDuckGo search API and gets back json string."""
 
     name: str = "duckduckgo_results_json"
     description: str = (
         "A wrapper around Duck Duck Go Search. "
         "Useful for when you need to answer questions about current events. "
-        "Input should be a search query. Output is a JSON array of the query results"
+        "Input should be a search query. Output is a JSON string array of the "
+        "query results"
     )
     max_results: int = Field(alias="num_results", default=4)
     api_wrapper: DuckDuckGoSearchAPIWrapper = Field(