Do a general language sweep

**Page on which the enhancement should be made**
All of them, pretty much!

**Describe the enhancement you would like**
Make all text compliant with [the language guidelines](https://dyalog.github.io/documentation-guidelines/latest/rules/#language).

**This impacts the following documents:**

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

Start with the language guidelines at https://dyalog.github.io/documentation-guidelines/latest/rules/#language, then review the listed documentation guides to determine the full scope. Done means all text across the affected guides complies with those guidelines, but the issue does not identify specific files or passages.

Written by the indexing model from the issue text.