[HTML2] deepObject parameter description is missing

Description

Endpoint parameters of style deepObject dont have description in generated page. E.g. in declaration file:

 "parameters": [         
  {
    "name": "deepObject_parameter",
    "in": "query",
    "description": "Decription of deepObject parameter",
    "style": "deepObject",
    "schema": {
      "$ref": "#/components/schemas/deepObjectSchema"
    }
  }

and deepObjectSchema:

  "deepObjectSchema": {
    "properties": {
      "object1": {
        "description": "Object one description.",
        "type": "string"
      },
      "object2": {
        "description": "Object two description.",
        "type": "string"
      }
    },
    "type": "object"
  }

generate the following output in html page:

Where none of inlined deepObject parameter has any description, neither description of "deepObject_parameter" itself nor description of objects in "deepObjectSchema".

Swagger-codegen version

 <groupId>io.swagger.codegen.v3</groupId>
 <artifactId>swagger-codegen-maven-plugin</artifactId>
 <version>3.0.33</version>

Swagger declaration file content or url

Example json declaration file that reproduces the problem:
https://gist.github.com/pakhopav/73c3c6feabdf8e049b35eeaba73025d6

Command line used for generation

mvn -f pom-generators.xml io.swagger.codegen.v3:swagger-codegen-maven-plugin:generate

Steps to reproduce

Generate html page using declaration file provided by the gist link above.

Related issues/PRs

Suggest a fix/enhancement

Context for templates should have description data for deepObject parameters, that could be than accessed in
https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/resources/htmlDocs2/param.mustache template

Start with modules/swagger-codegen/src/main/resources/htmlDocs2/param.mustache and reproduce the issue using the declaration file from the linked gist and the provided Maven command. Trace how deepObject parameters reach the template, then verify that the generated HTML includes both the parameter description and descriptions for its inlined schema properties.