Fix guide text issues

build-doc.sh

userguide/docs/admin.md

userguide/docs/clients.md

userguide/docs/img/cover.jpg

userguide/docs/index.md

userguide/mkdocs.yml

userguide/package-lock.json

userguide/site/admin/index.html

userguide/site/clients/index.html

userguide/site/img/cover.jpg

userguide/site/index.html

userguide/site/pdf/combined.pdf

userguide/site/search/search_index.json

userguide/site/sitemap.xml

userguide/site/sitemap.xml.gz

userguide/src/mkpdfs-mkdocs-plugin