chore: typo fix

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

src/Microsoft.OpenApi/Services/OpenApiWorkspace.cs

@@ -18,9 +18,9 @@ public class OpenApiWorkspace
     {
         private readonly Dictionary<string, Uri> _documentsIdRegistry = new();
         private readonly Dictionary<Uri, Stream> _artifactsRegistry = new();        
-        private readonly Dictionary<Uri, IOpenApiReferenceable> _IOpenApiReferenceableRegistry = new(new UriWithFragmentEquailityComparer());
+        private readonly Dictionary<Uri, IOpenApiReferenceable> _IOpenApiReferenceableRegistry = new(new UriWithFragmentEqualityComparer());
 
-        private class UriWithFragmentEquailityComparer : IEqualityComparer<Uri>
+        private sealed class UriWithFragmentEqualityComparer : IEqualityComparer<Uri>
         {
             public bool Equals(Uri? x, Uri? y)
             {