Update 02-process-proposal.md

docs/build/abci/02-process-proposal.md

@@ -17,7 +17,7 @@ Here is the implementation of the default implementation:
 https://github.com/cosmos/cosmos-sdk/blob/v0.52.0-beta.1/baseapp/abci_utils.go#L224-L231
 ```
 
-Like `PrepareProposal` this implementation is the default and can be modified by
+Like `PrepareProposal`, this implementation is the default and can be modified by
 the application developer in [`app_di.go`](https://docs.cosmos.network/main/build/building-apps/app-go-di). If you decide to implement
 your own `ProcessProposal` handler, you must ensure that the transactions
 provided in the proposal DO NOT exceed the maximum block gas and `maxtxbytes` (if set).