Minor fixes in documentations

+ Fix unescaped '<'
+ Fix typo

docs/_overwrites/Commands/PreconditionAttribute.Overwrites.md

@@ -31,11 +31,11 @@ The following example creates a precondition to see if the user has
 sufficient role required to access the command.
 
 ```cs
-public class RequireRoleAtribute : PreconditionAttribute
+public class RequireRoleAttribute : PreconditionAttribute
 {
     private readonly ulong _roleId;
 
-    public RequireRoleAtribute(ulong roleId)
+    public RequireRoleAttribute(ulong roleId)
     {
         _roleId = roleId;
     }

src/Discord.Net.Core/Entities/Emotes/Emote.cs

@@ -59,7 +59,7 @@ namespace Discord
         }
 
         /// <summary> Parses an <see cref="Emote"/> from its raw format. </summary>
-        /// <param name="text">The raw encoding of an emote; for example, <:dab:277855270321782784&gt;.</param>
+        /// <param name="text">The raw encoding of an emote; for example, &lt;:dab:277855270321782784&gt;.</param>
         /// <returns>An emote.</returns>
         /// <exception cref="ArgumentException">Invalid emote format.</exception>
         public static Emote Parse(string text)
@@ -70,7 +70,7 @@ namespace Discord
         }
 
         /// <summary> Tries to parse an <see cref="Emote"/> from its raw format. </summary>
-        /// <param name="text">The raw encoding of an emote; for example, <:dab:277855270321782784&gt;.</param>
+        /// <param name="text">The raw encoding of an emote; for example, &lt;:dab:277855270321782784&gt;.</param>
         /// <param name="result">An emote.</param>
         public static bool TryParse(string text, out Emote result)
         {

src/Discord.Net.Core/Entities/IMentionable.cs

@@ -9,7 +9,7 @@ namespace Discord
         ///     Returns a special string used to mention this object.
         /// </summary>
         /// <returns>
-        ///     A string that is recognized by Discord as a mention (e.g. <@168693960628371456&gt;).
+        ///     A string that is recognized by Discord as a mention (e.g. &lt;@168693960628371456&gt;).
         /// </returns>
         string Mention { get; }
     }

src/Discord.Net.Core/Entities/Users/IUser.cs

@@ -12,7 +12,7 @@ namespace Discord
         /// </summary>
         string AvatarId { get; }
         /// <summary>
-        ///     Gets the URL to this user's avatar.
+        ///     Returns the URL to this user's avatar.
         /// </summary>
         /// <param name="format">The format to return.</param>
         /// <param name="size">
@@ -23,7 +23,7 @@ namespace Discord
         /// </returns>
         string GetAvatarUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128);
         /// <summary>
-        ///     Gets the URL to this user's default avatar.
+        ///     Returns the URL to this user's default avatar.
         /// </summary>
         string GetDefaultAvatarUrl();
         /// <summary>
@@ -35,11 +35,11 @@ namespace Discord
         /// </summary>
         ushort DiscriminatorValue { get; }
         /// <summary>
-        ///     Returns <see langword="true"/> if this user is a bot user.
+        ///     Gets <see langword="true"/> if this user is a bot user.
         /// </summary>
         bool IsBot { get; }
         /// <summary>
-        ///     Returns <see langword="true"/> if this user is a webhook user.
+        ///     Gets <see langword="true"/> if this user is a webhook user.
         /// </summary>
         bool IsWebhook { get; }
         /// <summary>