Add guidance on inclusive language

### How could the content be improved?

The Code of Conduct section says `Use welcoming and inclusive language`, could we add some guidance or links for people to read to help them understand:

- What is inclusive language
- How it applies to Carpentries workshops / meetings etc?

Maybe in the [Equity, Inclusion, and Accessibility](https://carpentries.github.io/instructor-training/09-eia.html) section?
A quick search comes up with some nice collections of resources from UCL and Leeds Uni: [UCL Inclusive Language Toolkit](https://www.ucl.ac.uk/teaching-learning/publications/2023/jul/using-inclusive-language-education), [Leeds Inclusive Language Guidance](https://equality.leeds.ac.uk/support-and-resources/inclusive-language-guidance/)

### Which part of the content does your suggestion apply to?

https://carpentries.github.io/instructor-training/09-eia.html

Start with the Equity, Inclusion, and Accessibility section at 09-eia.html, especially the Code of Conduct wording about welcoming and inclusive language. Review the linked UCL and Leeds guidance, then add concise guidance or links explaining inclusive language and how it applies to Carpentries workshops and meetings. Done means the section provides readers with practical resources on both points.

Written by the indexing model from the issue text.