docs: remove the fixed Datadog know issue

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -9,7 +9,7 @@ body:
         Thanks for taking the time to fill out this bug report!
         Before submitting a bug, please double-check that your problem [is not
         a known issue](https://frankenphp.dev/docs/known-issues/)
-        (especially if you use XDebug, Tideways or Datadog), and that is has not
+        (especially if you use XDebug or Tideways), and that is has not
         [already been reported](https://github.com/dunglas/frankenphp/issues).
   - type: textarea
     id: what-happened

docs/known-issues.md

@@ -45,7 +45,6 @@ The following extensions have known bugs and unexpected behaviors when used with
 | Name                                                                                                                     | Problem                                                                                                                                                                                                                        |
 |--------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | [XDebug](https://xdebug.org/)                                                                                            | XDebug may crash, or hang. This problem is [being tracked by XDebug](https://github.com/dunglas/frankenphp/issues/563#issuecomment-1952226212).                                                                                |
-| [Datadog PHP Tracer](https://docs.datadoghq.com/fr/tracing/trace_collection/automatic_instrumentation/dd_libraries/php/) | The Datadog tracer [can cause crashes](https://github.com/dunglas/frankenphp/issues/458#issuecomment-1878487776). This has been reported to DataDog.                                                                           |
 | [Tideways](https://tideways.com/)                                                                                        | In worker mode, the Tideways extension [prevents worker scripts to finish properly](https://github.com/dunglas/frankenphp/issues/578#issuecomment-1966620351) or consumes 100% of the CPU. This has been reported to Tideways. |
 
 ## get_browser