fix typo

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/4-functions/g-7410.md

@@ -7,7 +7,7 @@
 
 Use packages to structure your code, combine procedures and functions which belong together.
 
-Package bodies may be changed and compiled without invalidating other packages. This is major advantage compared to standalone procedures and functions.
+Package bodies may be changed and compiled without invalidating other packages. This is a major advantage compared to standalone procedures and functions.
 
 ## Example (bad)