docs: fix typos, clarify wording

src/Discord.Net.Core/Entities/Guilds/GuildProperties.cs

@@ -71,17 +71,17 @@ namespace Discord
         /// </summary>
         public Optional<ExplicitContentFilterLevel> ExplicitContentFilter { get; set; }
         /// <summary>
-        ///     Gets or sets the flags that DISABLE types of system channels.
+        ///     Gets or sets the flags that DISABLE types of system channel messages.
         /// </summary>
         /// <remarks>
         ///     These flags are inverted. Setting a flag will disable that system channel message from being sent.
         ///     A value of <see cref="SystemChannelMessageDeny.None"/> will allow all system channel message types to be sent,
-        ///     given that the <see cref="SystemChannelId"/> has also been sent.
+        ///     given that the <see cref="SystemChannelId"/> has also been set.
         ///     A value of <see cref="SystemChannelMessageDeny.GuildBoost"/> will deny guild boost messages from being sent, and allow all
         ///     other types of messages.
         ///     Refer to the extension methods <see cref="GuildExtensions.GetGuildBoostMessagesEnabled(IGuild)"/> and
-        ///     <see cref="GuildExtensions.GetWelcomeMessagesEnabled(IGuild)"/> to check if these system channel messages
-        ///     are enabled, without the need to manipulate the flags.
+        ///     <see cref="GuildExtensions.GetWelcomeMessagesEnabled(IGuild)"/> to check if these system channel message types
+        ///     are enabled, without the need to manipulate the logic of the flag.
         /// </remarks>
         public Optional<SystemChannelMessageDeny> SystemChannelFlags { get; set; }
     }

src/Discord.Net.Core/Entities/Guilds/IGuild.cs

@@ -213,9 +213,6 @@ namespace Discord
         /// <summary>
         ///     Gets the URL of this guild's banner image.
         /// </summary>
-        /// <remarks>
-        ///     This is referred to as the vanity image in the API.
-        /// </remarks>
         /// <returns>
         ///     A URL pointing to the guild's banner image; <c>null</c> if none is set.
         /// </returns>
@@ -228,10 +225,10 @@ namespace Discord
         /// </returns>
         string VanityURLCode { get; }
         /// <summary>
-        ///     Gets the flags for the types of system channels that are disabled.
+        ///     Gets the flags for the types of system channel messages that are disabled.
         /// </summary>
         /// <returns>
-        ///     The flags for the types of system channel flags that are disabled.
+        ///     The flags for the types of system channel messages that are disabled.
         /// </returns>
         SystemChannelMessageDeny SystemChannelFlags { get; }
         /// <summary>
@@ -244,6 +241,9 @@ namespace Discord
         /// <summary>
         ///     Gets the number of premium subscribers of this guild.
         /// </summary>
+        /// <remarks>
+        ///     This is the number of users who have boosted this guild.
+        /// </remarks>
         /// <returns>
         ///     The number of premium subscribers of this guild.
         /// </returns>

src/Discord.Net.Core/Entities/Guilds/SystemChannelMessageDeny.cs

@@ -11,11 +11,11 @@ namespace Discord
         /// </summary>
         None = 0,
         /// <summary>
-        ///     The messages that are sent when a user joins the guild.
+        ///     Deny the messages that are sent when a user joins the guild.
         /// </summary>
         WelcomeMessage = 0b1,
         /// <summary>
-        ///     The messages that are sent when a user boosts the guild.
+        ///     Deny the messages that are sent when a user boosts the guild.
         /// </summary>
         GuildBoost = 0b10
     }

src/Discord.Net.Core/Extensions/GuildExtensions.cs

@@ -6,7 +6,7 @@ namespace Discord
     public static class GuildExtensions
     {
         /// <summary>
-        ///     Gets if welcome message system messages are enabled.
+        ///     Gets if welcome system messages are enabled.
         /// </summary>
         /// <param name="guild"> The guild to check. </param>
         /// <returns> A <c>bool</c> indicating if the welcome messages are enabled in the system channel. </returns>