Documentation and interface improvement: the module now tells editors
explicitly that a fixed value must be real data about the page,
not a placeholder used to fill a property in.
Publishing invented data (a made-up phone number, a price nobody pays) breaks
Google's structured data guidelines and can get the whole item ignored. The
warning now appears on the bundle mapping form, on the Views page-schema dialog,
in the Help page and in the README.
Map the fields you already have to Schema.org properties and let the module
emit the JSON-LD in the page <head> — no code, no duplicated
content. A property with no mapped source is simply not emitted, so the markup
always reflects the visible page.
