slice object -> slice item

Author: forman

docs/api.md

@@ -26,7 +26,7 @@ All described objects can be imported from the `zappend.api` module.
 
 ## Types
 
-::: zappend.api.SliceObj
+::: zappend.api.SliceItem
     options:
         show_root_heading: true
 

docs/guide.md

@@ -550,7 +550,7 @@ below.
 
 #### Paths and URIs
 
-A slice object of type `str` is interpreted as local file path or URI, in the case 
+A slice item of type `str` is interpreted as local file path or URI, in the case 
 the path has a protocol prefix, such as `s3://` as described above.
 
 In the majority of `zappend` use cases the slice datasets to be appended to a target