Update express API docs (#1363)

Author: wch

docs/_quartodoc-express.yml

@@ -144,6 +144,11 @@ quartodoc:
         - express.ui.panel_fixed
         - express.ui.panel_title
         - express.ui.panel_well
+    - title: Uploads & downloads
+      desc: Allow users to upload and download files.
+      contents:
+        - express.ui.input_file
+        - express.render.download
     - title: Dynamic UI
       desc: Dynamically show/hide UI elements.
       contents:

shiny/render/_express.py

@@ -24,7 +24,7 @@ class express(Renderer[None]):
     This is similar to :class:`~shiny.render.ui`, except that :class:`~shiny.render.ui`
     uses the return value from the the decorated function, whereas this function works
     like Shiny Express: as it executes each line of the decorated function, it calls
-    :func:`~sys.displayhook()` on the result. This has the effet of "capturing" the
+    :func:`~sys.displayhook()` on the result. This has the effect of "capturing" the
     output of each line.
 
     Returns

shiny/render/_render.py

@@ -575,6 +575,13 @@ class ui(Renderer[TagChild]):
     """
     Reactively render HTML content.
 
+    Note: If you want to write your function with Shiny Express syntax, where the UI
+    components are automatically captured as the code is evaluated, use
+    :func:`~shiny.express.render.express` instead of this function.
+
+    This function is used to render HTML content, but it requires that the funciton
+    returns the content, using Shiny Core syntax.
+
     Returns
     -------
     :
@@ -589,6 +596,8 @@ class ui(Renderer[TagChild]):
 
     See Also
     --------
+    * :func:`~shiny.express.render.express`
+    * :func:`~shiny.express.expressify`
     * :func:`~shiny.ui.output_ui`
     """