docs: update unstructured install instructions (#8596)

### Summary

Updates the `unstructured` install instructions. For
`unstructured>=0.9.0`, dependencies are broken out by document type and
the base `unstructured` package includes fewer dependencies. `pip
install "unstructured[local-inference]"` has been replace by `pip
install "unstructured[all-docs]"`, though the `local-inference` extra is
still supported for the time being.

### Reviewers

- @rlancemartin
- @eyurtsev
- @hwchase17

docs/extras/integrations/document_loaders/unstructured_file.ipynb

@@ -18,8 +18,7 @@
    "outputs": [],
    "source": [
     "# # Install package\n",
-    "!pip install \"unstructured[local-inference]\"\n",
-    "!pip install layoutparser[layoutmodels,tesseract]"
+    "!pip install \"unstructured[all-docs]\"\n"
    ]
   },
   {