Adds period and comma somehow missed

src/Discord.Net.Core/Entities/Permissions/GuildPermission.cs

@@ -16,8 +16,8 @@ namespace Discord
         // Text
         AddReactions        = 0x00_00_00_40,
         ViewAuditLog        = 0x00_00_00_80,
-        [Obsolete("Use ViewChannel instead")]
-        ReadMessages        = ViewChannel
+        [Obsolete("Use ViewChannel instead.")]
+        ReadMessages        = ViewChannel,
         ViewChannel         = 0x00_00_04_00,
         SendMessages        = 0x00_00_08_00,
         SendTTSMessages     = 0x00_00_10_00,