[BUG][Markdown] Missing `title` in the Model markdown

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Missing title in the Model markdown generated by markdown generator.

openapi-generator version

5.1.0

Generation Details

            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>5.1.0</version>
                <executions>
                    <execution>
                        <id>3</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/src/main/resources/search.api.yaml</inputSpec>
                            <generatorName>markdown</generatorName>
                            <output>${project.basedir}/doc/markdown/search</output>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

Steps to reproduce

1. Have following component schema in a yaml file

components:
  schemas:
    FooBar:
      title: Foo
      description: Bar

2. Use markdown generator to generate

Expect:

Actual:

Start by locating the markdown generator entry point and the template or rendering path for model schemas. Reproduce the issue with the shown FooBar schema, then verify that generated model markdown includes its title alongside the name, type, and description.