docs: typo in rag use case (#14800)

Description: Fixes minor typo to documentation

docs/docs/use_cases/question_answering/index.ipynb

@@ -55,7 +55,7 @@
     "\n",
     "#### Indexing\n",
     "1. **Load**: First we need to load our data. We'll use [DocumentLoaders](/docs/modules/data_connection/document_loaders/) for this.\n",
-    "2. **Split**: [Text splitters](/docs/modules/data_connection/document_transformers/) break large `Documents` into smaller chunks. This is useful both for indexing data and for passing it in to a model, since large chunks are harder to search over and won't in a model's finite context window.\n",
+    "2. **Split**: [Text splitters](/docs/modules/data_connection/document_transformers/) break large `Documents` into smaller chunks. This is useful both for indexing data and for passing it in to a model, since large chunks are harder to search over and won't fit in a model's finite context window.\n",
     "3. **Store**: We need somewhere to store and index our splits, so that they can later be searched over. This is often done using a [VectorStore](/docs/modules/data_connection/vectorstores/) and [Embeddings](/docs/modules/data_connection/text_embedding/) model.\n",
     "\n",
     "![index_diagram](../../../static/img/rag_indexing.png)\n",