Fix some typo and minor formatting issues in the docs

Author: AWhetter

.readthedocs.yml

@@ -5,6 +5,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
+  apt_packages:
+    - graphviz
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
@@ -23,4 +25,4 @@ python:
     - method: pip
       path: .
       extra_requirements:
-        - docs
+        - docs

docs/how_to.rst

@@ -111,7 +111,7 @@ Finally, you can configure what gets rendered by customising the templates.
 This is a rather heavy handed approach,
 so it should only be necessary when the other options do not give you
 the control the you need.
-You can learn how to customise the templates in the next section;
+You can learn how to customise the templates in the next section:
 :ref:`customise-templates`.
 
 
@@ -265,7 +265,7 @@ and set :confval:`autodoc_typehints` to ``description`` as normal::
 
 .. note::
 
-    Unless :confval:`autodoc_typehints` is set to ``none``,
+    Unless :confval:`autodoc_typehints` is set to ``None``,
     the type annotations of overloads will always be output in the signature
     and never merged into the description
     because it is impossible to represent all overloads as a list of parameters.

docs/reference/config.rst

@@ -173,7 +173,7 @@ Customisation Options
    Default: ``None``
 
    A callback that is called shortly after the Jinja environment is created.
-   It passed the Jinja environment for editing before template rendering begins.
+   The callback is passed the Jinja environment for editing before template rendering begins.
 
    The callback should have the following signature:
 
@@ -189,16 +189,16 @@ Customisation Options
    a single page. Valid levels, in descending order of hierarchy, are as
    follows:
 
-      * ``module``: Packages, modules, subpackages, and submodules.
+   * ``module``: Packages, modules, subpackages, and submodules.
 
-      * ``class``: Classes, exceptions, and all object types mentioned above.
+   * ``class``: Classes, exceptions, and all object types mentioned above.
 
-      * ``function``: Functions, and all object types mentioned above.
+   * ``function``: Functions, and all object types mentioned above.
 
-      * ``method``: Methods, and all object types mentioned above.
+   * ``method``: Methods, and all object types mentioned above.
 
-      * ``attribute``: Class and module level attributes, properties,
-        and all object types mentioned above.
+   * ``attribute``: Class and module level attributes, properties,
+     and all object types mentioned above.
 
 
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