Clarify the pastebin embed (#3455)

Author: nedbat

bot/resources/tags/paste.md

@@ -2,7 +2,7 @@
 embed:
     title: "Pasting large amounts of code"
 ---
-If your code is too long to fit in a codeblock in Discord, you can paste your code here:
+So that everyone can easily read your code, you can paste it in this website:
 https://paste.pythondiscord.com/
 
 After pasting your code, **save** it by clicking the Paste! button in the bottom left, or by pressing `CTRL + S`. After doing that, you will be navigated to the new paste's page. Copy the URL and post it here so others can see it.