Update xml/System.Text.Json.Nodes/JsonNode.xml

Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com>

Author: jairosoto05

xml/System.Text.Json.Nodes/JsonNode.xml

@@ -522,7 +522,7 @@ The underlying value of a <xref:System.Text.Json.Nodes.JsonValue> after deserial
       </Parameters>
       <Docs>
         <param name="value">A <see cref="T:System.Boolean" /> to explicitly convert.</param>
-        <summary>Defines an explicit conversion of a given <see cref="T:System.Text.Json.Nodes.JsonNode" /> to a <see cref="T:System.Boolean" />.</summary>
+        <summary>Defines an explicit conversion of a given nullable <see cref="T:System.Text.Json.Nodes.JsonNode" /> to a nullable <see cref="T:System.Boolean" />.</summary>
         <returns>A value converted from the <see cref="T:System.Text.Json.Nodes.JsonNode" /> instance.</returns>
         <remarks>To be added.</remarks>
       </Docs>