Update learn/specs/store.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: pthmas

learn/specs/store.md

@@ -25,7 +25,7 @@ Note: While blocks are stored as complete units in the store, the block manager
 - `SaveValidators`: Saves the validator set at a given height.
 - `GetValidators`: Returns the validator set at a given height.
 
-The `TxnDatastore` interface inside [go-datastore] is used for constructing different key-value stores for the underlying storage of a full node. The are two different implementations of `TxnDatastore` in [kv.go]:
+The `TxnDatastore` interface inside [go-datastore] is used for constructing different key-value stores for the underlying storage of a full node. There are two different implementations of `TxnDatastore` in [kv.go]:
 
 - `NewDefaultInMemoryKVStore`: Builds a key-value store that uses the [BadgerDB] library and operates in-memory, without accessing the disk. Used only across unit tests and integration tests.