Added comments for regex addition

Author: ionite34

botcore/utils/regex.py

@@ -3,7 +3,7 @@
 import re
 
 DISCORD_INVITE = re.compile(
-    r"(https?://)?(www\.)?"
+    r"(https?://)?(www\.)?"                      # Optional http(s) and www.
     r"(discord([.,]|dot)gg|"                     # Could be discord.gg/
     r"discord([.,]|dot)com(/|slash)invite|"      # or discord.com/invite/
     r"discordapp([.,]|dot)com(/|slash)invite|"   # or discordapp.com/invite/