Refactor & document supported form fields

docs/plugins/development/forms.md

@@ -1,5 +1,7 @@
 # Forms
 
+## Form Classes
+
 NetBox provides several base form classes for use by plugins. These are documented below.
 
 * `NetBoxModelForm`
@@ -8,3 +10,69 @@ NetBox provides several base form classes for use by plugins. These are document
 * `NetBoxModelFilterSetForm`
 
 ### TODO: Include forms reference
+
+In addition to the [form fields provided by Django](https://docs.djangoproject.com/en/stable/ref/forms/fields/), NetBox provides several field classes for use within forms to handle specific types of data. These can be imported from `utilities.forms.fields` and are documented below.
+
+## General Purpose Fields
+
+::: utilities.forms.ColorField
+    selection:
+      members: false
+
+::: utilities.forms.CommentField
+    selection:
+      members: false
+
+::: utilities.forms.JSONField
+    selection:
+      members: false
+
+::: utilities.forms.MACAddressField
+    selection:
+      members: false
+
+::: utilities.forms.SlugField
+    selection:
+      members: false
+
+## Dynamic Object Fields
+
+::: utilities.forms.DynamicModelChoiceField
+    selection:
+      members: false
+
+::: utilities.forms.DynamicModelMultipleChoiceField
+    selection:
+      members: false
+
+## Content Type Fields
+
+::: utilities.forms.ContentTypeChoiceField
+    selection:
+      members: false
+
+::: utilities.forms.ContentTypeMultipleChoiceField
+    selection:
+      members: false
+
+## CSV Import Fields
+
+::: utilities.forms.CSVChoiceField
+    selection:
+      members: false
+
+::: utilities.forms.CSVMultipleChoiceField
+    selection:
+      members: false
+
+::: utilities.forms.CSVModelChoiceField
+    selection:
+      members: false
+
+::: utilities.forms.CSVContentTypeField
+    selection:
+      members: false
+
+::: utilities.forms.CSVMultipleContentTypeField
+    selection:
+      members: false