Update warning text during multisite cache flushes #270

Job	Run time
test / Unit test / PHP 5.6	3s
test / Unit test / PHP 7.0	5s
test / Unit test / PHP 7.1	6s
test / Unit test / PHP 7.2	4s
test / Unit test / PHP 7.3	4s
test / Unit test / PHP 7.4	4s
test / Unit test / PHP 8.0	6s
test / Unit test / PHP 8.1	3s
test / Unit test / PHP 8.2	5s
test / Functional - WP latest on PHP 5.6 with MySQL 8.0	3m 14s
test / Functional - WP latest on PHP 7.0 with MySQL 8.0	2m 28s
test / Functional - WP latest on PHP 7.1 with MySQL 8.0	3m 47s
test / Functional - WP latest on PHP 7.2 with MySQL 8.0	2m 48s
test / Functional - WP latest on PHP 7.3 with MySQL 8.0	2m 45s
test / Functional - WP latest on PHP 7.4 with MySQL 8.0	3m 23s
test / Functional - WP latest on PHP 8.0 with MySQL 8.0	2m 22s
test / Functional - WP latest on PHP 8.1 with MySQL 8.0	3m 27s
test / Functional - WP latest on PHP 8.2 with MySQL 8.0	3m 17s
test / Functional - WP trunk on PHP 7.0 with MySQL 8.0	2m 56s
test / Functional - WP trunk on PHP 7.0 with MySQL 5.7	2m 45s
test / Functional - WP trunk on PHP 7.0 with MySQL 5.6	3m 20s
test / Functional - WP trunk on PHP 7.4 with MySQL 8.0	3m 9s
test / Functional - WP trunk on PHP 8.0 with MySQL 8.0	2m 51s
test / Functional - WP trunk on PHP 8.0 with MySQL 5.7	2m 48s
test / Functional - WP trunk on PHP 8.0 with MySQL 5.6	2m 45s
test / Functional - WP trunk on PHP 8.1 with MySQL 8.0	2m 53s
test / Functional - WP trunk on PHP 8.2 with MySQL 8.0	3m 52s
test / Functional - WP 3.7 on PHP 5.6 with MySQL 5.6	2m 13s
test / Functional - WP 6.2 on PHP 5.6 with MySQL 8.0	3m 58s
	1h 1m 41s

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