fix: phpcs, phpdoc issues #2882

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	16s
ci / MOODLE_35_STABLE - mariadb - php 7.1 - tool_dataflows	5m 6s
ci / MOODLE_35_STABLE - mariadb - php 7.2 - tool_dataflows	5m 18s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_dataflows	6m 55s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_dataflows	4m 16s
ci / MOODLE_35_STABLE - pgsql - php 7.1 - tool_dataflows	5m 12s
ci / MOODLE_35_STABLE - pgsql - php 7.2 - tool_dataflows	3m 48s
ci / MOODLE_36_STABLE - mariadb - php 7.1 - tool_dataflows	4m 58s
ci / MOODLE_37_STABLE - pgsql - php 7.2 - tool_dataflows	4m 2s
ci / MOODLE_38_STABLE - mariadb - php 7.3 - tool_dataflows	6m 13s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_dataflows	6m 30s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_dataflows	4m 5s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_dataflows	5m 22s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_dataflows	4m 12s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_dataflows	4m 46s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dataflows	9m 18s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dataflows	9m 34s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dataflows	7m 48s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dataflows	5m 17s
ci / Release to the Moodle plugin directory	0s
	1h 43m 1s

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