misc: fix error formatting in multiple files

channeldb/graph.go

@@ -3086,7 +3086,7 @@ func (c *ChannelGraph) IsPublicNode(pubKey [33]byte) (bool, error) {
 // genMultiSigP2WSH generates the p2wsh'd multisig script for 2 of 2 pubkeys.
 func genMultiSigP2WSH(aPub, bPub []byte) ([]byte, error) {
 	if len(aPub) != 33 || len(bPub) != 33 {
-		return nil, fmt.Errorf("Pubkey size error. Compressed " +
+		return nil, fmt.Errorf("pubkey size error. Compressed " +
 			"pubkeys only")
 	}
 
@@ -3833,7 +3833,7 @@ func putChanEdgePolicyUnknown(edges kvdb.RwBucket, channelID uint64,
 	byteOrder.PutUint64(edgeKey[33:], channelID)
 
 	if edges.Get(edgeKey[:]) != nil {
-		return fmt.Errorf("Cannot write unknown policy for channel %v "+
+		return fmt.Errorf("cannot write unknown policy for channel %v "+
 			" when there is already a policy present", channelID)
 	}