Closes #3467641 Fix CSpell issue with Bootstrap terminology.

Add Hoverable to the list of known words for CSpell.

.gitlab-ci.yml

@@ -23,7 +23,8 @@ include:
 # https://git.drupalcode.org/project/gitlab_templates/-/blob/main/includes/include.drupalci.variables.yml
 # Uncomment the lines below if you want to override any of the variables. The following is just an example.
 ################
-# variables:
+variables:
+  _CSPELL_WORDS: 'Hoverable'
 #   SKIP_ESLINT: '1'
 #   OPT_IN_TEST_NEXT_MAJOR: '1'
 #   _CURL_TEMPLATES_REF: 'main'