fix: discriminator constant for writing specs.

Signed-off-by: Alex Wichmann <VisualBean@users.noreply.github.com>

Author: VisualBean

src/ByteBard.AsyncAPI/Models/AsyncApiConstants.cs

@@ -87,7 +87,7 @@ public static class AsyncApiConstants
         public const string AdditionalProperties = "additionalProperties";
         public const string Format = "format";
         public const string Nullable = "nullable";
-        public const string Discriminator = "descriminator";
+        public const string Discriminator = "discriminator";
         public const string ReadOnly = "readOnly";
         public const string WriteOnly = "writeOnly";
         public const string Deprecated = "deprecated";