[hotfix][config][docs] Deprecate taskmanager.numberOfTaskSlots in mesos_task_manager_configuration.html

[zhengcanbin]

What is the purpose of the change

Deprecate taskmanager.numberOfTaskSlots in mesos_task_manager_configuration.html

[zhengcanbin]

cc @tisonkun

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[tisonkun]

Close as stale. The problem seems vanished.