Validation: Fix minor spelling mistakes
## Issue
-Validation plugins operate as indenpendent blackboxes.
+Validation plugins operate as independent blackboxes.
For every backend each mounted validation plugin iterates
over the whole keyset, checks every key for its trigger metakey,
and validates the key.
@@ -55,7 +55,7 @@ for what should happen on kdbGet and handle problems e.g.
## Decision
-Use a wapper plugin to iterate over the keyset and delegate the validation
+Use a wrapper plugin to iterate over the keyset and delegate the validation
of each key to the corresponding validation plugin.
## Argument
