bpo-35054: Add yet more index entries for symbols. (GH-10121) (GH-10171)

(cherry picked from commit 913876d824d969f8c7431e8a9d4610a9a11a786e)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index edcbb3a..f6ff010 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -152,7 +152,7 @@
       Accepts a :term:`path-like object`.
 
 
-.. index:: single: ~; home directory expansion
+.. index:: single: ~ (tilde); home directory expansion
 
 .. function:: expanduser(path)
 
@@ -178,8 +178,8 @@
       Accepts a :term:`path-like object`.
 
 .. index::
-   single: $; environment variables expansion
-   single: %; environment variables expansion (Windows)
+   single: $ (dollar); environment variables expansion
+   single: % (percent); environment variables expansion (Windows)
 
 .. function:: expandvars(path)