Modification to EnsContext() documentation

### 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_

Start by locating the EnsContext() documentation and its ._capture_context() and ._restore_context() references, then find the corresponding EnSight documentation. Done means both context methods are explained and EnSight uses the same information consistently; no file or test is identified in the issue.

Written by the indexing model from the issue text.