[FAB-5931] Spelling error

[FAB-5931] Spelling error:
common/tools/configtxgen/provisional/provisional.go Line:70, `It it`
should be `It is`.

Change-Id: I4cff155ef4d5363c70de8d5338767862a2bdef32
Signed-off-by: Zhangjiong Xuan <xuanzhangjiong@hyperchain.cn>

Author: Zhangjiong Xuan

common/tools/configtxgen/provisional/provisional.go

@@ -67,7 +67,7 @@ const (
 	ConsensusTypeKafka = "kafka"
 
 	// TestChainID is the default value of ChainID. It is used by all testing
-	// networks. It it necessary to set and export this variable so that test
+	// networks. It is necessary to set and export this variable so that test
 	// clients can connect without being rejected for targeting a chain which
 	// does not exist.
 	TestChainID = "testchainid"