[html] Lists in response description, model description and property description are not generated properly.

Start with src/main/resources/handlebars/htmlDocs/index.mustache and inspect the response, model, and property description expressions shown in the issue. Generate the HTML documentation from the supplied OpenAPI example and verify that all list descriptions render as HTML lists rather than escaped tags.

As far as I know, the 'description' property in the swagger spec supports lists using * like:

* item1: 1
* item2: 2

The method description is correctly rendered as:

• item1: 1
• item2: 2

but in the response, model and property description it is incorrectly rendered as:

<ul> <li>item1: 1</li> <li>item2: 2</li> </ul>

There is a merged PR that solved the problem for the method description but not for the other cases (https://github.com/swagger-api/swagger-codegen-generators/pull/982)

This is a sample that shows the problem:

openapi: 3.0.0

info:
  title: API
  description: Process.
  version: 1.0.0

tags:
  - name: info
    description: Provides info.

paths:

  /info:
    post:
      description: |
              Right:
              * item1: 1
              * item2: 2

      responses:
        "200":
          description: |
              Wrong:
              * item3: 3
              * item4: 4
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Object"

components:
  schemas:

    Object:
      description: |
              Wrong:
              * item5: 5
              * item6: 6
      type: object
      properties:
        prop:
          description: |
              Wrong:
              * item7: 7
              * item8: 8

This is a diff that solves the problem:

diff --git a/src/main/resources/handlebars/htmlDocs/index.mustache b/src/main/resources/handlebars/htmlDocs/index.mustache
index 6d2c2001..d68a64c8 100644
--- a/src/main/resources/handlebars/htmlDocs/index.mustache
+++ b/src/main/resources/handlebars/htmlDocs/index.mustache
@@ -133,7 +133,7 @@
     <h3 class="field-label">Responses</h3>
     {{#responses}}
     <h4 class="field-label">{{code}}</h4>
-    {{message}}
+    {{{message}}}
         {{#simpleType}}<a href="#{{dataType}}">{{dataType}}</a>{{/simpleType}}
     {{#examples}}
     <h3 class="field-label">Example data</h3>
@@ -164,9 +164,9 @@
   {{#model}}
   <div class="model">
     <h3><a name="{{name}}"><code>{{name}}</code>{{#title}} - {{title}}{{/title}}</a> <a class="up" href="#__Models">Up</a></h3>
-    {{#unescapedDescription}}<div class='model-description'>{{unescapedDescription}}</div>{{/unescapedDescription}}
+    {{#unescapedDescription}}<div class='model-description'>{{{unescapedDescription}}}</div>{{/unescapedDescription}}
     <div class="field-items">
-      {{#vars}}<div class="param">{{name}} {{^required}}(optional){{/required}}</div><div class="param-desc"><span class="param-type">{{#isNot this 'primitive-type'}}<a href="#{{complexType}}">{{datatype}}</a>{{/isNot}}</span> {{unescapedDescription}} {{#dataFormat}}format: {{{dataFormat}}}{{/dataFormat}}</div>
+	    {{#vars}}<div class="param">{{name}} {{^required}}(optional){{/required}}</div><div class="param-desc"><span class="param-type">{{#isNot this 'primitive-type'}}<a href="#{{complexType}}">{{datatype}}</a>{{/isNot}}</span> {{{unescapedDescription}}} {{#dataFormat}}format: {{{dataFormat}}}{{/dataFormat}}</div>
       {{#is this 'enum'}}
         <div class="param-enum-header">Enum:</div>
         {{#_enum}}<div class="param-enum">{{this}}</div>{{/_enum}}