[BUG] html2 generator: documentation for schemas is missing

Description

openapi-generator-maven-plugin fails to include documentation for schemas in the generated HTML documentation, despite configuring the plugin to do so.

openapi-generator version

7.5.0

plugin configuration

 <plugin>
          <groupId>org.openapitools</groupId>
          <artifactId>openapi-generator-maven-plugin</artifactId>
          <version>7.5.0</version>
          <executions>
              <execution>
                  <id>generate-html-docs</id>
                  <goals>
                      <goal>generate</goal>
                  </goals>
                  <configuration>
                      <inputSpec>${project.basedir}/spec.json</inputSpec>
                      <generatorName>html2</generatorName>
                      <output>${project.build.directory}/docs</output>
                      <generateModelDocumentation>true</generateModelDocumentation>
                  </configuration>
              </execution>
          </executions>
 </plugin>

OpenAPI declaration file content (spec.json)

{
  "openapi": "3.0.0",
  "info": {
    "title": "Sample contract",
    "version": "1.0.0"
  },
  "paths": {},
  "components": {
    "schemas": {
      "Request": {
        "type": "object",
        "required": ["token"],
        "properties": {
          "token": {
            "type": "string"
          }
        }
      }
    }
  }
}

Steps to reproduce

1. Use OpenApi spec provided
2. Generate html documentation: mvn clean package

Generated docs

Expected behaviour

The html2 generator of openapi-generator-maven-plugin should incorporate documentation for schemas within the resulting HTML documentation.

Start with the Maven plugin configuration and spec.json example in the issue, then run mvn clean package using the html2 generator. Inspect the generated HTML documentation for the Request schema and verify that schema documentation is included as expected.