Merge pull request #1537 from Textualize/fix-docs-api

Minor doc fixes.

docs/styles/grid/index.md

@@ -2,7 +2,7 @@
 
 There are a number of properties relating to the Textual `grid` layout.
 
-For an in-depth look at the grid layout, visit the grid [guide](../guide/layout.md#grid).
+For an in-depth look at the grid layout, visit the grid [guide](../../guide/layout.md#grid).
 
 | Property       | Description                                    |
 |----------------|------------------------------------------------|

mkdocs.yml

@@ -143,6 +143,7 @@ nav:
   - API:
     - "api/index.md"
     - "api/app.md"
+    - "api/binding.md"
     - "api/button.md"
     - "api/checkbox.md"
     - "api/color.md"
@@ -161,12 +162,15 @@ nav:
     - "api/message_pump.md"
     - "api/message.md"
     - "api/pilot.md"
+    - "api/placeholder.md"
     - "api/query.md"
     - "api/reactive.md"
     - "api/screen.md"
     - "api/static.md"
     - "api/text_log.md"
     - "api/timer.md"
+    - "api/tree.md"
+    - "api/tree_node.md"
     - "api/walk.md"
     - "api/widget.md"
   - "Blog":