Merge pull request #5308 from davep/fix-tree-typo

Correct a typo in Tree.add

Author: willmcgugan

src/textual/widgets/_tree.py

@@ -374,7 +374,7 @@ def add(
             before: Optional index or `TreeNode` to add the node before.
             after: Optional index or `TreeNode` to add the node after.
             expand: Node should be expanded.
-            allow_expand: Allow use to expand the node via keyboard or mouse.
+            allow_expand: Allow user to expand the node via keyboard or mouse.
 
         Returns:
             A new Tree node