[3.7] bpo-35054: Add more index entries for symbols. (GH-10064). (GH-10120)

(cherry picked from commit ddb961d2abe5d5fde76d85b21a77e4e91e0043ad)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Doc/reference/import.rst b/Doc/reference/import.rst
index 44b5b81..7c4f275 100644
--- a/Doc/reference/import.rst
+++ b/Doc/reference/import.rst
@@ -127,8 +127,8 @@
 ------------------
 
 .. index::
-    pair:: package; namespace
-    pair:: package; portion
+    pair: package; namespace
+    pair: package; portion
 
 A namespace package is a composite of various :term:`portions <portion>`,
 where each portion contributes a subpackage to the parent package.  Portions