doc: fix typo in packages.md

PR-URL: #40230
Fixes: #40228
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api/packages.md

@@ -603,7 +603,7 @@ use in Node.js but not the browser:
 ```
 
 Conditions continue to be matched in order as with flat conditions. If
-a nested conditional does not have any mapping it will continue checking
+a nested condition does not have any mapping it will continue checking
 the remaining conditions of the parent condition. In this way nested
 conditions behave analogously to nested JavaScript `if` statements.