Docs for allowNewTargetOutsideFunction (#2724)

Co-authored-by: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>

docs/parser.md

@@ -34,6 +34,7 @@ mind. When in doubt, use `.parse()`.
 
 | Version | Changes |
 | --- | --- |
+| `v7.21.0` | Added `allowNewTargetOutsideFunction` |
 | `v7.16.0` | Added `startColumn` |
 | `v7.15.0` | Added `attachComment` |
 | `v7.7.0` | Added `errorRecovery` |
@@ -51,6 +52,9 @@ mind. When in doubt, use `.parse()`.
   top-level scope of scripts. This option is discouraged in favor of
   `topLevelAwait` plugin.
 
+- **allowNewTargetOutsideFunction**: By default, `new.target` use is not
+  allowed outside of a function or class. Set this to `true` to accept such code.
+
 - **allowReturnOutsideFunction**: By default, a return statement at
   the top level raises an error. Set this to `true` to accept such
   code.