This PR fixes CSpell check.
Indeed in the current main branch:
Error: Unknown word (Analyser)
site/content/docs/5.1/getting-started/accessibility.md:58:19 Unknown word (Analyser)
Files checked: 111, Issues found: 1 in 1 files.
Error: 1 spelling issue found in 1 of the 111 files checked.(Error can be found here for example: https://github.com/twbs/bootstrap/runs/5793443218?check_suite_focus=true)