fix displaying of images on github within the examples notebook

[clmould]

Description

Fixed the displaying of images within examples.ipynb so that images can be seen on github

Checklist

I confirm that I have completed the following checks:

• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[jonmaddock]

@timothy-nunn, can you take this review for Clair please? Thanks!