[ntuple] update on-disk format post

Co-authored-by: Philippe Canal <[email protected]>

blog/_posts/2024-11-28-rntuple-binary-format.md

@@ -89,7 +89,7 @@ Some other key features of the new format are
 Now, you may wonder how to actually read and write RNTuples.
 To do so, RNTuple comes with [a new set of APIs](https://root.cern.ch/doc/v634/group__tutorial__ntuple.html), too!
 Modern, safe, and easy to use correctly (so we hope!).
-The API, in contrast to the on-disk format, is not quite finished yet and did not leave the experimental stage.
+The API, in contrast to the on-disk format, is still evolving thanks to early adopters' feedback and is not quite ready to leave the experimental stage.
 
 An external API review—a first for the ROOT team—conducted by the
 [High Energy Physics Center for Computational Excellence](https://www.anl.gov/hep-cce) is still just about to conclude.