Fix invalid HTML

Author: gewarren

xml/System.Text.Json.Serialization.Metadata/JsonPropertyInfo.xml

@@ -176,9 +176,9 @@ The current <see cref="P:System.Text.Json.Serialization.Metadata.JsonPropertyInf
 
 For contracts that originate from <xref:System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver> or <xref:System.Text.Json.Serialization.JsonSerializerContext>, the value of this property is mapped from <xref:System.Text.Json.Serialization.JsonRequiredAttribute> annotations.
 
-For contracts that use <xref:System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver>, the value of this property is also mapped from properties that have the <see langword="required" /> modifier, unless deserialization uses a constructor that populates all required properties and has <xref:System.Diagnostics.CodeAnalysis.SetsRequiredMembersAttribute>.
+For contracts that use <xref:System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver>, the value of this property is also mapped from properties that have the `required` modifier, unless deserialization uses a constructor that populates all required properties and has <xref:System.Diagnostics.CodeAnalysis.SetsRequiredMembersAttribute>.
 
-The <see langword="required" /> keyword is currently not supported in <xref:System.Text.Json.Serialization.JsonSerializerContext> contracts.
+The `required` keyword is currently not supported in <xref:System.Text.Json.Serialization.JsonSerializerContext> contracts.
 
 ]]></format>
         </remarks>