update the number of years and installations

update the number of years AdGuard has been in development and the number of users who have installed AdGuard during that time

docs/intro.md

@@ -28,7 +28,7 @@ Passwords, card details, and just plain personal information are at risk when a
 
 ### Trusted developer
 
-AdGuard has been present on the market of personal data protection and ad blocking and developing its line of software for more than 12 years. Over this time, our company has built an impeccable reputation, and the number of our customers has exceeded 30 million.
+AdGuard has been present on the market of personal data protection and ad blocking and developing its line of software for more than 15 years. Over this time, our company has built an impeccable reputation, and more than 410 million people have installed AdGuard.
 
 ### Unique VPN protocol