Added changelog entry

packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md

diff --git a/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md b/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
index 35b62b2..a26296c 100644
--- a/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
+++ b/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
@@ -37,6 +37,9 @@
 
 * Added a tooltip to describe the exception mode drop-down. -
 [#8849](https://github.com/flutter/devtools/pull/8849)
+* Either the 'pause' or the 'resume' buttons is displayed,
+  never both. -
+  [#4924](https://github.com/flutter/devtools/issues/4924)
 
 ## Network profiler updates