Fixed the example code (#4117)

Fixed the issue mentioned here:

https://github.com/hwchase17/langchain/issues/3799#issuecomment-1534785861

Co-authored-by: Pawel Faron <ext-pawel.faron@vaisala.com>

docs/use_cases/question_answering/semantic-search-over-chat.ipynb

@@ -102,7 +102,7 @@
     "pages = text_splitter.split_text(state_of_the_union)\n",
     "\n",
     "text_splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=100)\n",
-    "texts = text_splitter.split_documents(pages)\n",
+    "texts = text_splitter.create_documents(pages)\n",
     "\n",
     "print (texts)\n",
     "\n",