Update and future-proof screenshots

Screenshots should be included within the documentation if they are useful and add to the information that is being presented. When screenshots are included, it can be helpful to crop them to the relevant portion of the screen, both to emphasise what's being illustrated and to remove release-specific or operating-system-specific content.

Review all screenshots (including images of icons) within the documentation and do one of the following:

- remove the image if it does not enhance the information being presented.
- update the image if required, for example, a screenshot taken on an older version of Dyalog (cropping as necessary to only show the relevant information).
- leave the image as it is.

This impacts the following documents:

- [ ] Dyalog APL Language Reference Guide
- [x] Analysis
- [ ] Implementation
- [ ] Dyalog Programming Reference Guide
- [x] Analysis
- [ ] Implementation
- [ ] Dyalog for Microsoft Windows Installation and Configuration Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for Microsoft Windows UI Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for Microsoft Windows Object Reference Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for Microsoft Windows Interfaces Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for Microsoft Windows .NET Framework Interface Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for UNIX Installation and Configuration Guide
- [ ] Analysis
- [ ] Implementation
- [ ] Dyalog for UNIX UI Guide
- [ ] Analysis
- [ ] Implementation

Any new documents brought across from the previous project should also be checked/amended as appropriate.