Improve Discord section (en)

Fix some typos and improve grammar.
Reword recommendation targeting "younger" developers.

Author: stomar

en/community/index.md

@@ -24,9 +24,9 @@ to start:
   list is a great way to get answers.
 
 [Ruby Discord Server](https://discord.gg/UyQnKrT)
-: The Ruby Language Discord Server is a place where you can:
-  chat with other other Rubyist, get help with Ruby questions or help others.
-  Discord is a good entrypoint for younger developers and it's easy to join.
+: The Ruby Language Discord Server is a place where you can
+  chat with other Rubyists, get help with Ruby questions, or help others.
+  Discord is a good entry point for new developers and it is easy to join.
 
 [Ruby on IRC (#ruby)](irc://irc.freenode.net/ruby)
 : The Ruby Language IRC Channel is a wonderful way to chat with fellow