ns-openapi-3-1: normalize-parameter-examples refractor plugin incorrectly sets schema example as an array of examples

[glowcloud]

When normalizing a parameter such as

     "name": {
       "name": "name",
       "in": "query",
       "description": "name of the pet",
       "required": false,
       "schema": {
         "type": "string",
         "example": "schema example"
       },
       "examples": {
         "example1": {
           "value": "examples example"
         }
       }
     }

the example field in the schema will be normalized to:

"example": ['examples example']

Instead, it should be normalized to:

"example": "examples example"

This happens because we set example to the array of examples:

apidom/packages/apidom-ns-openapi-3-1/src/refractor/plugins/normalize-parameter-examples.ts

Lines 100 to 103 in 1a6da7f

	if (typeof parameterElement.schema.example !== 'undefined') {
	parameterElement.schema.set('example', examples);
	storage!.append(parameterJSONPointer);
	}

instead, we should be setting it to the first example of the examples array like we do in the normalize-header-examples plugin:

apidom/packages/apidom-ns-openapi-3-1/src/refractor/plugins/normalize-header-examples/index.ts

Lines 100 to 103 in 1a6da7f

	if (typeof headerElement.schema.example !== 'undefined') {
	headerElement.schema.set('example', examples[0]);
	storage!.append(headerJSONPointer);
	}

[char0n]

Addressed in #4230