JsonDocument is not thread safe (#31508)

Author: gewarren

docs/standard/serialization/system-text-json/overview.md

@@ -42,24 +42,7 @@ For information about security threats that were considered when designing <xref
 
 ## Thread safety
 
-The `System.Text.Json` types are thread-safe, including:
-
-:::zone pivot="dotnet-5-0,dotnet-core-3-1"
-
-* <xref:System.Text.Json.JsonSerializer>
-* <xref:System.Text.Json.Utf8JsonReader>
-* <xref:System.Text.Json.Utf8JsonWriter>
-* <xref:System.Text.Json.JsonDocument>
-:::zone-end
-
-:::zone pivot="dotnet-7-0,dotnet-6-0"
-
-* <xref:System.Text.Json.JsonSerializer>
-* <xref:System.Text.Json.Utf8JsonReader>
-* <xref:System.Text.Json.Utf8JsonWriter>
-* <xref:System.Text.Json.JsonDocument>
-* <xref:System.Text.Json.Nodes.JsonNode>
-:::zone-end
+The `System.Text.Json` serializer was designed with thread safety in mind. Practically, this means that once locked, <xref:System.Text.Json.JsonSerializerOptions> instances can be safely shared across multiple threads.
 
 ## Additional resources