Swagger api to generate HTML from yaml

Hi amitrao2344 

The html2 template does support Markdown in `description` fields, particularly the one in an operation. 

Although Markdown tables can be tricky to get right. In this case there are line breaks between the rows which cause it not to render a table. If you remove the lines between rows you should see better results.

openapi: 3.0.0
info:
  title: Test API
  version: 1.0.0

paths:
  /something:
    post:
      description: |-
        Invalid request. There was an issue with the metric data provided in the request body. Possible error codes returned:

        Error Code                | Description          | Parameters Example
        --------------------------|----------------------|----------------------------
        BAD_REQUEST               | Cannot read request body for some reason. For instance, request contains fields with invalid format of integer, number, boolean, etc. | |
        INVALID_DATE_TIME_FORMAT  | The date time format of start time and/or end time fields is invalid. | |
        MISSING_REQUIRED_FIELDS   | One or more required fields for the metric were not provided or have nullable value. | "fields": \[ "deploymentUuid", "productShortCode", "measureUnit", "quantity", "startTime", "endTime"\]
        OUT_OF_BOUNDS_VALUE       | One or more fields have out of bounds value. | "fields": \[ {"fieldName": "quantity", "minValue": 1, "maxValue": 2147483647} \]
        MIN_LENGTH_REQUIRED       | One or more fields have the minimum field value length less than required. | "fields": \[ {"fieldName": "productShortCode", "minLength": 1}\]
        MAX_LENGTH_EXCEEDED       | One or more fields exceeded the maximum field value length. | "fields": \[ {"fieldName": "measureunit", "maxLength": 50}\]
        INVALID_DEPLOYMENT_UUID   | Deployment UUID should contain only alphanumeric characters and dashes. | |
        START_TIME_AFTER_END_TIME | Start time value should be before the end time value. | |
        REQUEST_EXPIRED           | The request reached the service more than 24 hours after the end time value. | |
        END_TIME_IN_FUTURE        | End time should not be in the future. | |
        MAX_TIME_PERIOD_DURATION_EXCEEDED | Time period between start and end time should not be greater than max time period duration. | "maxTimePeriodDurationInHours": 24
        CUSTOM_DATA_MAX_SIZE_EXCEEDED | Custom data field exceeded maximum number of key/value pairs. | "maxCustomDataSize": 10|
        CUSTOM_DATA_PROPERTY_MIN_LENGTH_REQUIRED | One or more custom data property key and/or value are nullable or have min length less than required. | "minKeyLength": 1, "minValueLength": 1
        CUSTOM_DATA_PROPERTY_MAX_LENGTH_EXCEEDED | One or more custom data property key and/or value have exceeded max length. | "maxKeyLength": 256, "maxValueLength": 256

      tags:
      - Notification
      responses:
       default: 
         description: ok