doc: clarify from review
@@ -16,7 +16,8 @@ encoded within a key name part.
- restrict what `keySetBaseName` can accept is against:
- easy to use of API: applications with some key names would suddenly fail
- hard to use it wrong API: storage plugins that do not pre-process key names properly would fail to build up a KeySet
- which would be against our goal to support any configuration file format (e.g. TOML supports empty key part names).
+ which would be against our goal to support any configuration file format (i.e., any valid file of some format can be transformed to a KeySet,
+ e.g. TOML supports empty key part names).
## Decision
