Documentation: clarify number properties in addressbook RPC interface

[jengelh]

Diff between 20220114..20230405 added this, to which I have a comment:

+=== Named properties (0x8000 – 0xfffe)
+
+[NOTE]
+The actual meaning of these item types can be overwritten by the
+name-to-id map.
+
+[cols="1,1,1,5",options="header"]
+|===
+| Item type | Value type | Identifier | Description
+| 0x8001 | 0x000b (Boolean) | PR_EMS_AB_DISPLAY_NAME_OVERRIDE | [yellow-background]*Unknown*
+| | | |

The addressbook RPC interface (NSPI) does not have any calls for named property translation, in other words, there is no concept of named properties at all and 0x8000..0xFFFE are just regular tagged properties there.

[joachimmetz]

@jengelh thx for that context, I'll have a look when time permits. This are work in progress notes.