Improve documentation for core is-installed command #332

Job	Run time
test / Unit test / PHP 5.6	4s
test / Unit test / PHP 7.0	6s
test / Unit test / PHP 7.1	4s
test / Unit test / PHP 7.2	5s
test / Unit test / PHP 7.3	3s
test / Unit test / PHP 7.4	4s
test / Unit test / PHP 8.0	6s
test / Unit test / PHP 8.1	7s
test / Unit test / PHP 8.2	4s
test / Functional - WP latest on PHP 5.6 with MySQL 8.0	2m 3s
test / Functional - WP latest on PHP 7.0 with MySQL 8.0	1m 57s
test / Functional - WP latest on PHP 7.1 with MySQL 8.0	1m 56s
test / Functional - WP latest on PHP 7.2 with MySQL 8.0	2m 9s
test / Functional - WP latest on PHP 7.3 with MySQL 8.0	2m 10s
test / Functional - WP latest on PHP 7.4 with MySQL 8.0	2m 8s
test / Functional - WP latest on PHP 8.0 with MySQL 8.0	2m 9s
test / Functional - WP latest on PHP 8.1 with MySQL 8.0	1m 57s
test / Functional - WP latest on PHP 8.2 with MySQL 8.0	2m 10s
test / Functional - WP trunk on PHP 5.6 with MySQL 8.0	2m 12s
test / Functional - WP trunk on PHP 5.6 with MySQL 5.7	2m 9s
test / Functional - WP trunk on PHP 5.6 with MySQL 5.6	2m 10s
test / Functional - WP trunk on PHP 7.4 with MySQL 8.0	2m 9s
test / Functional - WP trunk on PHP 8.0 with MySQL 8.0	1m 59s
test / Functional - WP trunk on PHP 8.0 with MySQL 5.7	1m 56s
test / Functional - WP trunk on PHP 8.0 with MySQL 5.6	2m 8s
test / Functional - WP trunk on PHP 8.1 with MySQL 8.0	2m 12s
test / Functional - WP trunk on PHP 8.2 with MySQL 8.0	1m 56s
test / Functional - WP 3.7 on PHP 5.6 with MySQL 5.6	2m 10s
	40m 23s

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