Reorganize configuration docs

docs/configuration/data-validation.md

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+# Data & Validation Parameters
+
+## CUSTOM_VALIDATORS
+
+!!! tip "Dynamic Configuration Parameter"
+
+This is a mapping of models to [custom validators](../customization/custom-validation.md) that have been defined locally to enforce custom validation logic. An example is provided below:
+
+```python
+CUSTOM_VALIDATORS = {
+    "dcim.site": [
+        {
+            "name": {
+                "min_length": 5,
+                "max_length": 30
+            }
+        },
+        "my_plugin.validators.Validator1"
+    ],
+    "dim.device": [
+        "my_plugin.validators.Validator1"
+    ]
+}
+```
+
+---
+
+## FIELD_CHOICES
+
+Some static choice fields on models can be configured with custom values. This is done by defining `FIELD_CHOICES` as a dictionary mapping model fields to their choices. Each choice in the list must have a database value and a human-friendly label, and may optionally specify a color. (A list of available colors is provided below.)
+
+The choices provided can either replace the stock choices provided by NetBox, or append to them. To _replace_ the available choices, specify the app, model, and field name separated by dots. For example, the site model would be referenced as `dcim.Site.status`. To _extend_ the available choices, append a plus sign to the end of this string (e.g. `dcim.Site.status+`).
+
+For example, the following configuration would replace the default site status choices with the options Foo, Bar, and Baz:
+
+```python
+FIELD_CHOICES = {
+    'dcim.Site.status': (
+        ('foo', 'Foo', 'red'),
+        ('bar', 'Bar', 'green'),
+        ('baz', 'Baz', 'blue'),
+    )
+}
+```
+
+Appending a plus sign to the field identifier would instead _add_ these choices to the ones already offered:
+
+```python
+FIELD_CHOICES = {
+    'dcim.Site.status+': (
+        ...
+    )
+}
+```
+
+The following model fields support configurable choices:
+
+* `circuits.Circuit.status`
+* `dcim.Device.status`
+* `dcim.Location.status`
+* `dcim.PowerFeed.status`
+* `dcim.Rack.status`
+* `dcim.Site.status`
+* `extras.JournalEntry.kind`
+* `ipam.IPAddress.status`
+* `ipam.IPRange.status`
+* `ipam.Prefix.status`
+* `ipam.VLAN.status`
+* `virtualization.Cluster.status`
+* `virtualization.VirtualMachine.status`
+
+The following colors are supported:
+
+* `blue`
+* `indigo`
+* `purple`
+* `pink`
+* `red`
+* `orange`
+* `yellow`
+* `green`
+* `teal`
+* `cyan`
+* `gray`
+* `black`
+* `white`