fix: phpcs, phpdoc issues #2886

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	10s
ci / MOODLE_35_STABLE - mariadb - php 7.1 - tool_dataflows	5m 26s
ci / MOODLE_35_STABLE - pgsql - php 7.1 - tool_dataflows	4m 46s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_dataflows	8m 40s
ci / MOODLE_35_STABLE - mariadb - php 7.2 - tool_dataflows	5m 56s
ci / MOODLE_35_STABLE - pgsql - php 7.2 - tool_dataflows	4m 35s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_dataflows	6m 5s
ci / MOODLE_36_STABLE - mariadb - php 7.1 - tool_dataflows	5m 13s
ci / MOODLE_37_STABLE - pgsql - php 7.2 - tool_dataflows	5m 21s
ci / MOODLE_38_STABLE - mariadb - php 7.3 - tool_dataflows	6m 9s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_dataflows	6m 30s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_dataflows	4m 22s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_dataflows	6m 21s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_dataflows	5m 27s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_dataflows	5m 37s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dataflows	7m 19s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dataflows	4m 45s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dataflows	9m 52s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dataflows	6m 22s
ci / Release to the Moodle plugin directory	0s
	1h 49m 1s

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