Update neps/nep-0509.md

Co-authored-by: Marcelo Fornet <mfornet94@gmail.com>

neps/nep-0509.md

@@ -54,7 +54,7 @@ As a result, the team sought alternative approaches and concluded that stateless
 The current high-level chunk production flow, excluding details and edge cases, is as follows:
 
 * Block producer at height `H`, `BP(H)`, produces block `B(H)` with chunks accessible to it and distributes it.
-* Chunk producer for shard `S` at height `H+1` `CP(S, H+1)` produces chunk `C(S, H+1)` based on `B(H)` and distributes it.
+* Chunk producer for shard `S` at height `H+1`, `CP(S, H+1)`, produces chunk `C(S, H+1)` based on `B(H)` and distributes it.
 * `BP(H+1)` collects all chunks at height `H+1` until certain timeout is reached.
 * `BP(H+1)` produces block `B(H+1)` with chunks `C(*, H+1)` accessible to it and distributes it, etc.