Fix error messages to match ember-template-lint exactly

- boolean: use default case (produces "a boolean.") instead of custom
  "a boolean (true or false)"
- id/idlist: no trailing period, matching original lines 27/30
- Move period from message template into each description to match
  original's per-case punctuation

Author: johanrd

lib/rules/template-no-invalid-aria-attributes.js

@@ -68,29 +68,23 @@ function getExpectedTypeDescription(attrName) {
     return 'a valid value';
   }
   switch (attrDef.type) {
-    case 'boolean':
-      return 'a boolean (true or false)';
     case 'tristate':
-      return 'a boolean or the string "mixed"';
-    case 'integer':
-      return 'an integer';
-    case 'number':
-      return 'a number';
+      return 'a boolean or the string "mixed".';
     case 'token': {
       const vals = attrDef.values.map((v) => (typeof v === 'boolean' ? v.toString() : v));
-      return `a single token from the following: ${vals.join(', ')}`;
+      return `a single token from the following: ${vals.join(', ')}.`;
     }
     case 'tokenlist': {
-      return `a list of one or more tokens from the following: ${attrDef.values.join(', ')}`;
+      return `a list of one or more tokens from the following: ${attrDef.values.join(', ')}.`;
     }
-    case 'id':
-      return 'a string that represents a DOM element ID';
     case 'idlist':
       return 'a list of strings that represent DOM element IDs (idlist)';
-    case 'string':
-      return 'a string';
+    case 'id':
+      return 'a string that represents a DOM element ID';
+    case 'integer':
+      return 'an integer.';
     default:
-      return 'a valid value';
+      return `a ${attrDef.type}.`;
   }
 }
 
@@ -107,7 +101,7 @@ module.exports = {
     schema: [],
     messages: {
       noInvalidAriaAttribute: 'Invalid ARIA attribute: {{attribute}}',
-      invalidAriaAttributeValue: 'The value for {{attribute}} must be {{expectedType}}.',
+      invalidAriaAttributeValue: 'The value for {{attribute}} must be {{expectedType}}',
     },
     originallyFrom: {
       name: 'ember-template-lint',