Rakudo env var RAKUDO_POD_DECL_BLOCK_USER_FORMAT is not shown on the environment variables page

[tbrowder]

Problem or new feature

Although it is mentioned in the docs as having been added with Rakudo v2020.01.

[lizmat]

@tbrowder FWIW, I think we can deprecate this environment variable, as in RakuAST all whitespace is preserved

[tbrowder]

Of course you're right, so be it!