Merge pull request #4424 from TomJGooding/docs-update-tab-activated-on-decorator-selector

docs: update TabActivated on decorator selector

Author: willmcgugan

docs/guide/events.md

@@ -268,7 +268,7 @@ The `on` decorator also accepts selectors as keyword arguments that may be used
 The snippet below shows how to match the message [`TabbedContent.TabActivated`][textual.widgets.TabbedContent.TabActivated] only when the tab with id `home` was activated:
 
 ```py
-@on(TabbedContent.TabActivated, tab="#home")
+@on(TabbedContent.TabActivated, pane="#home")
 def home_tab(self) -> None:
     self.log("Switched back to home tab.")
     ...

src/textual/_on.py

@@ -43,7 +43,7 @@ def quit_button(self) -> None:
     Example:
         ```python
         # Handle the activation of the tab "#home" within the `TabbedContent` "#tabs".
-        @on(TabbedContent.TabActivated, "#tabs", tab="#home")
+        @on(TabbedContent.TabActivated, "#tabs", pane="#home")
         def switch_to_home(self) -> None:
             self.log("Switching back to the home tab.")
             ...