docs: fix grammar in code comments

Signed-off-by: reddaisyy <reddaisy@outlook.jp>

Author: reddaisyy

pkg/cmd/run_node.go

@@ -28,7 +28,7 @@ import (
 	"github.com/evstack/ev-node/pkg/telemetry"
 )
 
-// ParseConfig is an helpers that loads the node configuration and validates it.
+// ParseConfig is a helper that loads the node configuration and validates it.
 func ParseConfig(cmd *cobra.Command) (rollconf.Config, error) {
 	nodeConfig, err := rollconf.Load(cmd)
 	if err != nil {

pkg/store/keys.go

@@ -11,7 +11,7 @@ const (
 	// It avoids to walk over the HeightToDAHeightKey to find the first DA included height.
 	GenesisDAHeightKey = "gdh"
 
-	// HeightToDAHeightKey is the key prefix used for persisting the mapping from a Evolve height
+	// HeightToDAHeightKey is the key prefix used for persisting the mapping from an Evolve height
 	// to the DA height where the block's header/data was included.
 	// Full keys are like: rhb/<evolve_height>/h and rhb/<evolve_height>/d
 	HeightToDAHeightKey = "rhb"