bpo-35054: Add yet more index entries for symbols. (GH-10121)

diff --git a/Doc/library/curses.ascii.rst b/Doc/library/curses.ascii.rst
index 04b2a26..a69dbb2 100644
--- a/Doc/library/curses.ascii.rst
+++ b/Doc/library/curses.ascii.rst
@@ -207,6 +207,10 @@
 it returns a string.
 
 
+.. index::
+   single: ^ (caret); in curses module
+   single: ! (exclamation); in curses module
+
 .. function:: unctrl(c)
 
    Return a string representation of the ASCII character *c*.  If *c* is printable,