chore: remove 'mirror upstream' comment — describe logic directly

Author: johanrd

lib/rules/template-no-block-params-for-html-elements.js

@@ -1,6 +1,5 @@
 /** @type {import('eslint').Rule.RuleModule} */
 
-// Mirror upstream ember-template-lint's inverse-of-isAngleBracketComponent logic.
 // A tag is treated as an HTML element only when it:
 //   - does NOT contain ':' (named blocks like <:slot>)
 //   - does NOT contain '.' (path/namespaced invocations like <foo.bar>)