docs: Note of hidden properties #13719

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.3) / Sanity Tests	2m 54s
Others (8.2) / Sanity Tests	4m 36s
Others (8.4) / Sanity Tests	2m 49s
Others (8.1) / Sanity Tests	2m 34s
SeparateProcess (8.2) / tests	3m 47s
CacheLive (8.1) / Cache Live Tests	2m 10s
SeparateProcess (8.4) / tests	6m 0s
SeparateProcess (8.1) / tests	3m 58s
CacheLive (8.3) / Cache Live Tests	2m 18s
CacheLive (8.2) / Cache Live Tests	2m 22s
SeparateProcess (8.3) / tests	4m 33s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 34s
CacheLive (8.4) / Cache Live Tests	2m 2s
DatabaseLive (8.3, Postgre, 8.0) / tests	3m 10s
DatabaseLive (8.1, MySQLi, 8.0) / tests	5m 39s
DatabaseLive (8.1, SQLite3, 8.0) / tests	1m 56s
DatabaseLive (8.1, MySQLi, 5.7) / tests	2m 56s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 38s
DatabaseLive (8.4, MySQLi, 8.0) / tests	6m 11s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	5m 28s
DatabaseLive (8.2, MySQLi, 8.0) / tests	7m 30s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 28s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 58s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 40s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 46s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 22s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 46s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 23s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 43s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 34s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 18s
DatabaseLive (8.3, OCI8, 8.0) / tests	8m 0s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 13s
Upload coverage results to Coveralls / coveralls	51s
	2h 20m 10s

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