Fix another doc comment typo in JsonSerializerOptions.cs (#48591)

* Fix another doc comment typo in JsonSerializerOptions.cs

The following sentence in the doc comments for the `IncludeFields` member:

> Determines whether fields are handled serialization and deserialization.

Should read:

> Determines whether fields are handled **during** serialization and deserialization.

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs
Co-authored-by: NEirik Tsarpalis <eirik.tsarpalis@gmail.com>

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs

@@ -336,7 +336,7 @@ public bool IgnoreReadOnlyFields
         }
 
         /// <summary>
-        /// Determines whether fields are handled serialization and deserialization.
+        /// Determines whether fields are handled on serialization and deserialization.
         /// The default value is false.
         /// </summary>
         /// <exception cref="InvalidOperationException">