UnsupportedException already implements Exception via RuntimeException

docs/reference/exception-classes.txt

@@ -77,8 +77,7 @@ MongoDB\\Exception\\UnsupportedException
    unintended document being deleted.
 
    This class extends the library's :phpclass:`RuntimeException
-   <MongoDB\\Exception\\RuntimeException>` class and implements the
-   library's :phpclass:`Exception <MongoDB\\Exception\\Exception>` interface.
+   <MongoDB\\Exception\\RuntimeException>` class.
 
    .. note::
 

src/Exception/UnsupportedException.php

@@ -2,7 +2,7 @@
 
 namespace MongoDB\Exception;
 
-class UnsupportedException extends RuntimeException implements Exception
+class UnsupportedException extends RuntimeException
 {
     /**
      * Thrown when collations are not supported by a server.