(PDOC-127) Strip whitespace from type feature docstrings

[whopper]

No description provided.

[whopper]

Note: Puppet::Util::Doc.scrub doesn't strip newlines, so it seems we have to do it ourselves.

[whopper]

Here are the user type features without whitespace:

      "features": [
        {
          "name": "allows_duplicates",
          "description": "The provider supports duplicate users with the same UID."
        },
        {
          "name": "manages_homedir",
          "description": "The provider can create and remove home directories."
        },
        {
          "name": "manages_passwords",
          "description": "The provider can modify user passwords, by accepting a password hash."
        },
        {
          "name": "manages_password_age",
          "description": "The provider can set age requirements and restrictions for passwords."
        },
        {
          "name": "manages_password_salt",
          "description": "The provider can set a password salt. This is for providers that implement PBKDF2 passwords with salt properties."
        },
        {
          "name": "manages_solaris_rbac",
          "description": "The provider can manage roles and normal users"
        },
        {
          "name": "manages_expiry",
          "description": "The provider can manage the expiry date for a user."
        },
        {
          "name": "system_users",
          "description": "The provider allows you to create system users with lower UIDs."
        },
        {
          "name": "manages_aix_lam",
          "description": "The provider can manage AIX Loadable Authentication Module (LAM) system."
        },
        {
          "name": "libuser",
          "description": "Allows local users to be managed on systems that also use some other remote NSS method of managing accounts."
        },
        {
          "name": "manages_shell",
          "description": "The provider allows for setting shell and validates if possible"
        },
        {
          "name": "manages_loginclass",
          "description": "The provider can manage the login class for a user."
        }
      ]
    }
  ],