Slightly reword and fix grammar

Author: enirolf

README.md

@@ -7,7 +7,7 @@ To that end, each test comes with a written description of the schema and the ex
 Eventually, we will also provide a set of reference `.root` and `.json` files (see below).
 
 > [!WARNING]
-> The RNTuple Validation Suite is currently work-in-progress.
+> The RNTuple Validation Suite is currently work in progress.
 > Its structure and implementation may change during development.
 > We welcome early feedback on the current state from any interested party.
 
@@ -22,7 +22,7 @@ More tests are planned in the future, please [consult the list of issues](https:
 ## Reference Implementation
 
 This repository also contains a reference implementation with ROOT macros.
-They currently target ROOT v6.34 with the first official version of the on-disk binary format.
+They currently target ROOT v6.34 with the first official version of the RNTuple on-disk binary format.
 In this release, the API is not yet finalized and all classes are in the `ROOT::Experimental` namespace.
 We plan to rely on this version until a first version of the RNTuple Validation Suite is done.
 Then we will produce a first set of reference files that can be used to test backwards compatibility.