bpo-33610: Update IDLE Code Context doc entry (GH-7597)


Users can now click on context lines.
(cherry picked from commit af4b0130d44bf8a1ff4f7b46195d1dc79add444a)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index af15359..58e6193 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -274,7 +274,8 @@
 
 Code Context (toggle)(Editor Window only)
    Open a pane at the top of the edit window which shows the block context
-   of the code which has scrolled above the top of the window.
+   of the code which has scrolled above the top of the window.  Clicking a
+   line in this pane exposes that line at the top of the editor.
 
 Window menu (Shell and Editor)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^