MetricKit tvOS xcode15.0 b3

#MetricKit.framework https://github.com/xamarin/xamarin-macios/pull/18958

diff -ruN /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/MetricKit.framework/Headers/MXMetaData.h /Applications/Xcode_15.0.0-beta3.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/MetricKit.framework/Headers/MXMetaData.h
--- /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/MetricKit.framework/Headers/MXMetaData.h	2023-06-10 02:24:22
+++ /Applications/Xcode_15.0.0-beta3.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/MetricKit.framework/Headers/MXMetaData.h	2023-06-23 13:00:55
@@ -63,7 +63,8 @@
 
 /*!
  @property      pid
- @abstract      pid of the process for which this diagnostic  was generated
+ @abstract      pid of the process
+ @note          A value of -1 indicates that the PID was unavailable for the containing payload.
  */
 
 @property (readonly) pid_t pid API_AVAILABLE(macos(14.0), ios(17.0)) API_UNAVAILABLE(tvos, watchos);