[HTML2] Not making use of method examples

Description

Examples for parameters or return values are nowhere to be found in the resulting document.

Swagger-codegen version

2.2.1

Swagger declaration file content or url

swagger: '2.0'
info:
  version: 0.0.0
  title: Simple API
paths:
  /:
    get:
      parameters:
      - name: body
        in: body
        schema:
          type: string
          example: |
              foo
              bar
      responses:
        200:
          description: OK
          schema:
            type: string
            example: |
              foo
              bar