Update registration/doc.go

Co-authored-by: Matthias Fasching <[email protected]>

registration/doc.go

@@ -4,7 +4,7 @@ Package registration provides functionality for registering PoET challenges, sch
 Each round starts by being open for receiving challenges (byte arrays) from miners.
 Once finalized (according to the configured duration), a hash digest is created from the received challenges,
 and is used as the input for the proof generation. The hash is the root of a merkle tree constructed from registered challenges
-sorted lexigraphically.
+sorted lexicographically.
 The proof generation is done by a worker, which can be a separate process that communicates with the registration service.
 
 Once completed, the proof is stored in a database and available for nodes via a GRPC query.