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"
    ]
   },
   {

docs/extras/integrations/providers/unstructured.mdx

@@ -11,7 +11,9 @@ ecosystem within LangChain.
 If you are using a loader that runs locally, use the following steps to get `unstructured` and
 its dependencies running locally.
 
-- Install the Python SDK with `pip install "unstructured[local-inference]"`
+- Install the Python SDK with `pip install unstructured`.
+    - You can install document specific dependencies with extras, i.e. `pip install "unstructured[docx]"`.
+    - To install the dependencies for all document types, use `pip install "unstructured[all-docs]"`.
 - Install the following system dependencies if they are not already available on your system.
   Depending on what document types you're parsing, you may not need all of these.
     - `libmagic-dev` (filetype detection)