[Privacy XML export] standardized convention for domain (Redo #22240)

[cyrezdev]

REDO #22240

Use standardized strings for domain name and description in Privacy request xml export file.

[brianteeman]

I have tested this item ✅ successfully on 18faa4c

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[alikon]

I have tested this item ✅ successfully on 18faa4c

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[Quy]

RTC

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[mbabker]

https://docs.joomla.org/J3.x:Integrate_Extensions_with_the_Privacy_Component needs to be updated to reflect the standardization of name/description

[cyrezdev]

Well, someone edited code example before i do ;-)

About details for name and description, maybe to give some insights and recommendation on naming to keep futur usability when xml use programmatically ?

eg by replacing this part:

Domain name - A name to identify the domain
Domain description - A short description of the data contained in the domain

By this:

Domain name - A name to identify the domain (lowercase underscore separated string for reusability as a variable) eg "user_galleries"
Domain description - A short description of the data contained in the domain (lowercase underscore separated string recommended for reusability as a variable) eg "joomla_user_galleries_data"

RTC and if ok, i will update docs.
Note that if for name, it seems to me a good idea to use a variable, maybe not mandatory to request the same for description (recommended, but not required ?).

So, open to comments!