docs: remove stray space

Co-authored-by: Carson Sievert <[email protected]>

Author: gadenbuie

shiny/ui/_chat.py

@@ -513,7 +513,7 @@ async def append_message(
             links (see note below).
         icon
             An optional icon to display next to the message, currently only used for
-            assistant messages . The icon can be any HTML element (e.g., an
+            assistant messages. The icon can be any HTML element (e.g., an
             :func:`~shiny.ui.img` tag) or a string of HTML.
 
         Note
@@ -608,7 +608,7 @@ async def append_message_stream(
             specially formatted **input suggestion** links (see note below).
         icon
             An optional icon to display next to the message, currently only used for
-            assistant messages . The icon can be any HTML element (e.g., an
+            assistant messages. The icon can be any HTML element (e.g., an
             :func:`~shiny.ui.img` tag) or a string of HTML.
 
         Note