Update JsonSerializer.xml (#9864)

issue finds in documentation related to functions SerializeToElement() which return a JsonElement, not a JsonDocument.

Author: PerfidusPistor

xml/System.Text.Json/JsonSerializer.xml

@@ -4151,8 +4151,8 @@ For more information, see [How to serialize and deserialize JSON](/dotnet/standa
         <param name="value">The value to convert.</param>
         <param name="inputType">The type of the <paramref name="value" /> to convert.</param>
         <param name="options">Options to control the conversion behavior.</param>
-        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonDocument" />.</summary>
-        <returns>A <see cref="T:System.Text.Json.JsonDocument" /> representation of the value.</returns>
+        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonElement" />.</summary>
+        <returns>A <see cref="T:System.Text.Json.JsonElement" /> representation of the value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.ArgumentException">
           <paramref name="inputType" /> is not compatible with <paramref name="value" />.</exception>
@@ -4194,8 +4194,8 @@ For more information, see [How to serialize and deserialize JSON](/dotnet/standa
         <param name="value">The value to convert.</param>
         <param name="inputType">The type of the <paramref name="value" /> to convert.</param>
         <param name="context">A metadata provider for serializable types.</param>
-        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonDocument" />.</summary>
-        <returns>A <see cref="T:System.Text.Json.JsonDocument" /> representation of the value.</returns>
+        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonElement" />.</summary>
+        <returns>A <see cref="T:System.Text.Json.JsonElement" /> representation of the value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.NotSupportedException">There is no compatible <see cref="T:System.Text.Json.Serialization.JsonConverter" /> for <paramref name="inputType" /> or its serializable members.</exception>
         <exception cref="T:System.InvalidOperationException">The <see cref="M:System.Text.Json.Serialization.JsonSerializerContext.GetTypeInfo(System.Type)" /> method of the provided <paramref name="context" /> returns <see langword="null" /> for the type to convert.</exception>
@@ -4250,8 +4250,8 @@ For more information, see [How to serialize and deserialize JSON](/dotnet/standa
         <typeparam name="TValue">The type of the value to serialize.</typeparam>
         <param name="value">The value to convert.</param>
         <param name="options">Options to control the conversion behavior.</param>
-        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonDocument" />.</summary>
-        <returns>A <see cref="T:System.Text.Json.JsonDocument" /> representation of the JSON value.</returns>
+        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonElement" />.</summary>
+        <returns>A <see cref="T:System.Text.Json.JsonElement" /> representation of the JSON value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.NotSupportedException">There is no compatible <see cref="T:System.Text.Json.Serialization.JsonConverter" /> for <typeparamref name="TValue" /> or its serializable members.</exception>
       </Docs>
@@ -4290,8 +4290,8 @@ For more information, see [How to serialize and deserialize JSON](/dotnet/standa
         <typeparam name="TValue">The type of the value to serialize.</typeparam>
         <param name="value">The value to convert.</param>
         <param name="jsonTypeInfo">Metadata about the type to convert.</param>
-        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonDocument" />.</summary>
-        <returns>A <see cref="T:System.Text.Json.JsonDocument" /> representation of the value.</returns>
+        <summary>Converts the provided value into a <see cref="T:System.Text.Json.JsonElement" />.</summary>
+        <returns>A <see cref="T:System.Text.Json.JsonElement" /> representation of the value.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.NotSupportedException">There is no compatible <see cref="T:System.Text.Json.Serialization.JsonConverter" /> for <typeparamref name="TValue" /> or its serializable members.</exception>
         <exception cref="T:System.ArgumentNullException">