feat: document intent error code messages (#3871)

* Add 4013, Invalid Intents close code

* Add 4014, Disallowed Intents Code

* Add error messages for 4013 & 4014

* Rephrase invalid & disallowed intent error message

* Rephrase disallowed intent error message

src/errors/Messages.js

@@ -17,6 +17,8 @@ const Messages = {
 
   SHARDING_INVALID: 'Invalid shard settings were provided.',
   SHARDING_REQUIRED: 'This session would have handled too many guilds - Sharding is required.',
+  INVALID_INTENTS: 'Invalid intent provided for WebSocket intents.',
+  DISALLOWED_INTENTS: 'Privileged intent provided is not enabled or whitelisted.',
   SHARDING_NO_SHARDS: 'No shards have been spawned.',
   SHARDING_IN_PROCESS: 'Shards are still being spawned.',
   SHARDING_ALREADY_SPAWNED: count => `Already spawned ${count} shards.`,

src/util/Constants.js

@@ -95,6 +95,8 @@ exports.WSCodes = {
   4004: 'TOKEN_INVALID',
   4010: 'SHARDING_INVALID',
   4011: 'SHARDING_REQUIRED',
+  4013: 'INVALID_INTENTS',
+  4014: 'DISALLOWED_INTENTS',
 };
 
 const AllowedImageFormats = ['webp', 'png', 'jpg', 'gif'];