PHPLIB-818: Remove Watch::FULL_DOCUMENT_DEFAULT constant

Author: alcaeus

UPGRADE-2.0.md

@@ -3,6 +3,8 @@ UPGRADE FROM 1.x to 2.0
 
  * Classes in the namespace `MongoDB\Operation\` are `final`.
  * The `MongoDB\ChangeStream::CURSOR_NOT_FOUND` constant is now private.
+ * The `MongoDB\Operation\Watch::FULL_DOCUMENT_DEFAULT` constant has been
+   removed.
 
 GridFS
 ------

src/Operation/Watch.php

@@ -59,7 +59,6 @@
  */
 final class Watch implements Executable, /* @internal */ CommandSubscriber
 {
-    public const FULL_DOCUMENT_DEFAULT = 'default';
     public const FULL_DOCUMENT_UPDATE_LOOKUP = 'updateLookup';
     public const FULL_DOCUMENT_WHEN_AVAILABLE = 'whenAvailable';
     public const FULL_DOCUMENT_REQUIRED = 'required';