Fix a typo in MongoConverter javadoc.

Original pull request: #3758.

Author: Ryan Gibb

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/MongoConverter.java

@@ -39,13 +39,14 @@
  * @author Thomas Darimont
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Ryan Gibb
  */
 public interface MongoConverter
 		extends EntityConverter<MongoPersistentEntity<?>, MongoPersistentProperty, Object, Bson>, MongoWriter<Object>,
 		EntityReader<Object, Bson> {
 
 	/**
-	 * Returns thw {@link TypeMapper} being used to write type information into {@link Document}s created with that
+	 * Returns the {@link TypeMapper} being used to write type information into {@link Document}s created with that
 	 * converter.
 	 *
 	 * @return will never be {@literal null}.