Move name and id properties on boundaries back to the common section …

…of the docs.

docs/layers.md

@@ -141,6 +141,8 @@ Combination of OpenStreetMap administrative boundaries (zoom >= 8) and Natural E
 
 #### Boundaries properties (common):
 
+* `name`: A suggested label, formed from the left and right region names, if available. If the name appears to be too long to be rendered on the geometry at a particular zoom it may be omitted.
+* `id`: Identifier for the feature, only provided at zoom 13+.
 * `kind`: mapping of OpenStreetMap's `admin_level` int values to strings like `country` and `state`, plus `aboriginal_lands` boundary type, and also includes normalized Natural Earth values.
 * `kind_detail`: mapping of OpenStreetMap's `admin_level` values. `2` for countries, `4` for regions, and `6`, `8` (zoom 10+)
 * `source`: `openstreetmap.org` or `naturalearthdata.com`
@@ -149,8 +151,6 @@ Combination of OpenStreetMap administrative boundaries (zoom >= 8) and Natural E
 
 #### Boundaries properties (common optional):
 
-* `name`: A suggested label, formed from the left and right region names, if available. If the name appears to be too long to be rendered on the geometry at a particular zoom it may be omitted.
-* `id`: Identifier for the feature, only provided at zoom 13+.
 * `id:left`: For the relation on the left side of the boundary line. This is only provided at zoom 13+.
 * `id:right`: For the relation on the right side of the boundary line. This is only provided at zoom 13+.
 * `name:left`: See name section above, other variants like `old_name` also supported. _See planned bug fix in [#1102](https://github.com/tilezen/vector-datasource/issues/1102)._