Add docs for Pretty, fix some reference issues in docs (#2678)

docs/widgets/pretty.md

@@ -0,0 +1,44 @@
+# Pretty
+
+Display a pretty-formatted object.
+
+- [ ] Focusable
+- [ ] Container
+
+## Example
+
+The example below shows a pretty-formatted `dict`, but `Pretty` can display any Python object.
+
+=== "Output"
+
+    ```{.textual path="docs/examples/widgets/pretty.py"}
+    ```
+
+=== "pretty.py"
+
+    ```python
+    --8<-- "docs/examples/widgets/pretty.py"
+    ```
+
+## Reactive Attributes
+
+This widget has no reactive attributes.
+
+## Messages
+
+This widget posts no messages.
+
+## Bindings
+
+This widget has no bindings.
+
+## Component Classes
+
+This widget has no component classes.
+
+---
+
+
+::: textual.widgets.Pretty
+    options:
+        heading_level: 2

docs/widgets/static.md

@@ -32,6 +32,7 @@ This widget sends no messages.
 ## See Also
 
 * [Label](./label.md)
+* [Pretty](./pretty.md)
 
 
 ---