Docs required for special_address in metallb component

[knrt10]

Currenly in configuration example we are showing use for special_addresses but there is not refrence to it in attribute-reference table. We need to document it.

[knrt10]

Can we say this is fixed by 173e517#diff-32657cb248d48ce75b8dd96cac5450b3R88?

[invidian]

Personally, I still do not understand what this option is doing and how to use it, so I'd say we should improve that still.

[knrt10]

@ipochi @surajssd any ideas?

[ipochi]

I think thats a map key/value field. Doesn't have any special meaning to it.

[invidian]

To rephrase, as a user, under what conditions I should care to set special_addresses to something? And to what?

[ipochi]

@johananl Does having the key default or special_addresses carry a special meaning in metallb ?

[johananl]

Nope, these are likely sample address pool names.
IIRC I've opted for using a map for specifying address pools because each pool has a name and an array of prefixes, hence map[string][]string.

[johananl]

If these names are confusing, please feel free to change them to something more intuitive.

[johananl]

Fixed in #996.