fix: block resolution of item-level example (via #1423)

* housekeeping: add passing nested resolver tests

* linter fixes

* fix: block resolution of item-level `example`

Author: shockey

src/specmap/helpers.js

@@ -37,7 +37,8 @@ const freelyNamedPaths = [
 //
 // Warning! These are powerful. Beware of edge cases.
 const freelyNamedAncestors = [
-  'schema/example'
+  'schema/example',
+  'items/example',
 ]
 
 export function isFreelyNamed(parentPath) {

test/specmap/refs.js

@@ -434,6 +434,9 @@ describe('refs', () => {
                                       display: {
                                         type: 'string'
                                       }
+                                    },
+                                    example: {
+                                      $ref: '#/whatever'
                                     }
                                   }
                                 }