Doc Review: Workspace.md

[meichthys]

Please ensure the following:
- Without any previous knowledge about Trilium, can I accomplish what's explained in the documentation by strictly following only what's written in it?
- Is the language clear and unambiguous?
- Any language issues/misspellings or deviation from terminology used elsewhere in docs?
- Are more screenshots needed?
- Is the division of the document well structured using headings?
- Are step by step instructions marked with numbered lists?
- Do existing screenshots reflect current version? If not, create new ones.