message: doc: Explain why we call performance.clear*
diff: @@ -517,6 +517,10 @@ export class Tracing implements Integration {
  addSpan(evaluation);
  }
  + // The Performance object has a limited buffer size, often 150 entries. At some point the buffer may overflow, in
  + // which case we would not be able to use it to create/update spans. Therefore, after we have processed entries to
  + // report to Sentry, we clear the buffer in an attempt to allow for more entries to be added in the future.
  + // https://developer.mozilla.org/en-US/docs/Web/API/Performance
  logger.log('[Tracing] Clearing most performance marks');
  performance.clearMarks();
  performance.clearMeasures();
  