Description of work

Recently, an ADS observer was added to MSlice. This allows monitoring changes to the ADS and reacting accordingly. This new functionality should be covered by manual tests, so I have updated the manual testing instructions for MSlice.

Fixes #38491.

To test:

Read the new instructions and check grammar and spelling.

For following the test instructions, the MSlice version in Mantid needs to be updated to the latest MSlice nightly version.

This does not require release notes because it is a change of the developer documentation and not user facing.

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Functional Tests

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