Fix incorrect wikipage summaries (#2169)

Creating a page using the title causes a wikipedia search with
autocomplete set to true. This frequently causes the summaries to be
unrelated to the actual page found.

See:
1554943e8a/wikipedia/wikipedia.py (L254-L280)

langchain/utilities/wikipedia.py

@@ -47,7 +47,7 @@ class WikipediaAPIWrapper(BaseModel):
 
     def fetch_formatted_page_summary(self, page: str) -> Optional[str]:
         try:
-            wiki_page = self.wiki_client.page(title=page)
+            wiki_page = self.wiki_client.page(pageid=page)
             return f"Page: {page}\nSummary: {wiki_page.summary}"
         except (
             self.wiki_client.exceptions.PageError,