docs: mark getters as @ readonly

src/structures/VoiceState.js

@@ -58,6 +58,7 @@ class VoiceState extends Base {
   /**
    * The member that this voice state belongs to
    * @type {?GuildMember}
+   * @readonly
    */
   get member() {
     return this.guild.members.get(this.id) || null;
@@ -66,6 +67,7 @@ class VoiceState extends Base {
   /**
    * The channel that the member is connected to
    * @type {?VoiceChannel}
+   * @readonly
    */
   get channel() {
     return this.guild.channels.get(this.channelID) || null;
@@ -74,6 +76,7 @@ class VoiceState extends Base {
   /**
    * Whether this member is either self-deafened or server-deafened
    * @type {?boolean}
+   * @readonly
    */
   get deaf() {
     return this.serverDeaf || this.selfDeaf;
@@ -82,6 +85,7 @@ class VoiceState extends Base {
   /**
    * Whether this member is either self-muted or server-muted
    * @type {?boolean}
+   * @readonly
    */
   get mute() {
     return this.serverMute || this.selfMute;
@@ -91,6 +95,7 @@ class VoiceState extends Base {
    * Whether this member is currently speaking. A boolean if the information is available (aka
    * the bot is connected to any voice channel in the guild), otherwise this is null
    * @type {?boolean}
+   * @readonly
    */
   get speaking() {
     return this.channel && this.channel.connection ?