Brief: Use italics for code syntax highlighting and related.
Symbol: modus-themes-italic-constructs (‘boolean’ type)
Possible values:
nil (default)
t
The default is to not use slanted text forms (italics) unless it is absolutely necessary.
With a non-nil value (t) choose to render more faces in italics. This
typically affects documentation strings and code comments.
Advanced users may also want to configure the exact attributes of the
italic face.