Add info about kaddressbook dependancy.

CCBUG: 432228
1 job for release/20.12 in 8 minutes and 34 seconds (queued for 35 minutes and 31 seconds)
Status Name Job ID Coverage
failed build_clazy_clang_tidy #90306


Name Stage Failure
build_clazy_clang_tidy Build
make[2]: *** [plugins/messageviewerplugins/autotests/CMakeFiles/viewerplugincreateeventtest.dir/build.make:239: bin/viewerplugincreateeventtest] Error 1
make[1]: *** [CMakeFiles/Makefile2:4096: plugins/messageviewerplugins/autotests/CMakeFiles/viewerplugincreateeventtest.dir/all] Error 2
make: *** [Makefile:160: 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