README.md should follow d.o markdown template

.gitlab-ci.yml

@@ -24,6 +24,7 @@ include:
 # Uncomment the lines below if you want to override any of the variables. The following is just an example.
 ################
 variables:
+  _CSPELL_WORDS: 'ptmkenny'
   CORE_PHP_MIN: "8.2"
   OPT_IN_TEST_MAX_PHP: '1'
   OPT_IN_TEST_NEXT_MAJOR: '1'