[BUG][HTML] Parameter names garbled in generated documentation, '-' is replaced with 'Minus'

Description

Parameter names are garbled in html output, - is replaced with Minus in parameter names.

openapi-generator version

5.3.1

OpenAPI declaration file content or url

See modified petstore.yaml gist

Generation Details / Steps to Reproduce

curl https://gist.githubusercontent.com/lpar/4af360f8a2c94d2a31c6e12062f2812c/raw/1a11fd965c099669677f3b79c4eecbb73e4f34b8/petstore2.yaml > petstore2.yaml
mkdir petstore
npx openapi-generator-cli version-manager set 5.3.1
npx openapi-generator-cli generate -i petstore2.yaml -g html -o petstore
grep Minus petstore/index.html

Related issues/PRs

Somewhat related to #6465, which is a similar problem in html2 affecting HTTP headers.

Suggest a fix

I'm guessing that the templates for html are using a variable which contains a parameter name that has been sanitized for code generation. Presumably html2 uses the correct variable name (at least for parameters), as it doesn't have the same bug.

Start by reproducing the issue with the linked petstore2.yaml and the documented html generation commands, then inspect the html templates that render parameter names. Compare the parameter variable used by html with the behavior of html2, as suggested in the report. Done means generated HTML preserves '-' in parameter names instead of rendering it as 'Minus'; verify with grep on petstore/index.html.