Fix inline code in directives docs

[izzyreal]

Backticks are missing for 2 directives.

[lwronski]

Missing backticks are missing for 2 directives.

@izzyreal Thank you for your contribution. Please update the ObjectWrapper and Python case class for the using directives in order to generate the reference docs based on the @DirectiveUsage defined in the code. After making the changes, please run command:

./mill -i generate-reference-doc.run

Update the second parameter in @DirectiveUsage(usage: String, usageMd: String) which refer to markdown content.

[izzyreal]

Thanks @lwronski, please check again
1da4ea1

[lwronski]

@izzyreal, thank you! These changes will be available in the documentation after the release of Scala CLI 1.0.2.