Modification to EnsContext() documentation

[kecolburn]

Description of the modifications

EnsContext() documentation needs further information of the ._capture_context() and ._restore_context()
In addition, having EnSight use the same documentation as well.

Useful links and references

No response

[mariostieriansys]

@kecolburn the methods _capture_context() and _restore_context() are private, and they are not supposed to be called directly.
In session there are wrapper calls, capture_context() and restore_context() that can be used, and that will call these for you.
Also, they will call the _ methods directly in EnSight, rather than through PyEnSight.

Is there any reason why you would like to use directly the _capture_context() and _restore_context() feature?