Unify usage of "reverse domain name notation"

[chrbertsch]

In some places we talk about "reverse domain notation", in others about "reverse domain name notation"

We use the "reverse domain name notation" at several places, with different restrictions and requirements

• https://fmi-standard.org/docs/3.0.1/#modelDescription.xml for the annotations
• https://fmi-standard.org/docs/3.0.1/#fmiTerminalsAndIcons for the terminals
• https://fmi-standard.org/docs/3.0.1/#extra-directory for the /extra directory
• https://fmi-standard.org/docs/3.0.1/#VersioningLayered for the fmi-ls-manifest.xml attributes

Shall we unify this at one place?

[chrbertsch]

Nikolai: "reverse domain name notation" is also used on Wikipedia