The slash in the path parameter should not be escaped in order to
support multi path segment parameters.

Example:

This change allows the support for storage object keys in the path.
The following specification would allow `objectKey`s to contain a slash
for folder support:

```
paths:
  /api/{objectKey}:
    parameters:
    - name: objectKey
      in: path
      required: true
      description: The object key
      schema:
        type: string
    get:
      operationId: download
      summary: Download file
```