Update docs

Author: robbievanleeuwen

CONTRIBUTING.md

@@ -83,7 +83,7 @@ poetry install
 Install with the `rhino` and `cad` extras:
 
 ```shell
-poetry install --all-extras
+poetry install --extras "dxf rhino"
 ```
 
 You can now run an interactive Python session, or the command-line interface:

docs/contributing.rst

@@ -95,7 +95,7 @@ Install with the ``rhino`` and ``cad`` extras:
 
 .. code:: shell
 
-   poetry install --all-extras
+   poetry install --extras "dxf rhino"
 
 You can now run an interactive Python session, or the command-line interface:
 

docs/installation.rst

@@ -43,6 +43,3 @@ To install ``sectionproperties`` with the above functionality, use the ``dxf`` a
 
     pip install sectionproperties[dxf]
     pip install sectionproperties[rhino]
-
-Note that the ``rhino`` option only supports python ``3.9`` due to incomplete wheel
-coverage of ``rhino3dm``.

docs/user_guide/geometry.rst

@@ -111,10 +111,10 @@ Various CAD files can be imported to creating ``sectionproperties`` geometries.
     installation. To install ``sectionproperties`` with CAD import functionality,  use
     the ``dxf`` and/or ``rhino`` options:
 
-.. code-block:: shell
+    .. code-block:: shell
 
-    pip install sectionproperties[dxf]
-    pip install sectionproperties[rhino]
+        pip install sectionproperties[dxf]
+        pip install sectionproperties[rhino]
 
 .. _label-geometry-dxf: