Fix typo in code_understanding.ipynb (#9899)

seperate -> separate

docs/extras/use_cases/code_understanding.ipynb

@@ -25,7 +25,7 @@
     "In particular, we can employ a [splitting strategy](https://python.langchain.com/docs/integrations/document_loaders/source_code) that does a few things:\n",
     "\n",
     "* Keeps each top-level function and class in the code is loaded into separate documents. \n",
-    "* Puts remaining into a seperate document.\n",
+    "* Puts remaining into a separate document.\n",
     "* Retains metadata about where each split comes from\n",
     "\n",
     "## Quickstart"
@@ -94,7 +94,7 @@
     "We load the py code using [`LanguageParser`](https://python.langchain.com/docs/integrations/document_loaders/source_code), which will:\n",
     "\n",
     "* Keep top-level functions and classes together (into a single document)\n",
-    "* Put remaining code into a seperate document\n",
+    "* Put remaining code into a separate document\n",
     "* Retains metadata about where each split comes from"
    ]
   },