bpo-37925: Mention --embed in python-config usage (GH-15458)

(cherry picked from commit d3cc189b17c86f670198aca109b5ffa2d526d87a)

Co-authored-by: Batuhan Taşkaya <47358913+isidentical@users.noreply.github.com>
diff --git a/Misc/python-config.sh.in b/Misc/python-config.sh.in
index 59101d5..2602fe2 100644
--- a/Misc/python-config.sh.in
+++ b/Misc/python-config.sh.in
@@ -4,7 +4,7 @@
 
 exit_with_usage ()
 {
-    echo "Usage: $0 --prefix|--exec-prefix|--includes|--libs|--cflags|--ldflags|--extension-suffix|--help|--abiflags|--configdir"
+    echo "Usage: $0 --prefix|--exec-prefix|--includes|--libs|--cflags|--ldflags|--extension-suffix|--help|--abiflags|--configdir|--embed"
     exit $1
 }