38056 updates

[warunawickramasingha]

Description of work

Update manual testing instructions for the slice viewer

Fixes #38056
Fixes #38649.

Test instructions

1- The dev-docs-html target should build without any error/warings.
2- Open the index.html from \build\dev-docs\html
3- Search for the SliceViewer Testing and follow the updated test instructions listed in the below issues.
#38056
#38649.
4- The updated test instructions above should reflect the real observations.

Note: No unit test or release notes were added since its just an update to test documentation.

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[RichardWaiteSTFC]

Looks good, thanks for collating and fixing these issues! Just a small thing about the screenshot, but otherwise looks great thanks!

[warunawickramasingha]

Looks good, thanks for collating and fixing these issues! Just a small thing about the screenshot, but otherwise looks great thanks!

Thanks for taking a look. Can you please specify which screenshot needs updating(as there are 2 in the PR) and what is the change required?
Thanks!