Fix description in changelog

1 job for release/21.08 in 3 minutes and 59 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Build
failed build_clazy_clang_tidy #118316

00:03:59

 
Name Stage Failure
failed
build_clazy_clang_tidy Build
[  9%] Built target doc-index-cache-bz2
[ 9%] Built target kalarm_bin_autogen
make: *** [Makefile:146: all] Error 2
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1