chore: remove repetitive words (#2327)

Signed-off-by: shandongzhejiang <[email protected]>

Author: shandongzhejiang

cmd/devp2p/nodesetcmd.go

@@ -181,7 +181,7 @@ func parseFilterLimit(args []string) (int, error) {
 	return limit, nil
 }
 
-// andFilter parses node filters in args and and returns a single filter that requires all
+// andFilter parses node filters in args and returns a single filter that requires all
 // of them to match.
 func andFilter(args []string) (nodeFilter, error) {
 	checks, err := parseFilters(args)

docs/docs/_developers/dns-discovery-setup.md

@@ -30,7 +30,7 @@ go get -u github.com/celo-org/celo-blockchain/cmd/ethkey
 ### Crawling the v4 DHT
 
 Our first step is to compile a list of all reachable nodes. The DHT crawler in cmd/devp2p
-is a batch process which runs for a set amount of time. You should should schedule this command
+is a batch process which runs for a set amount of time. You should schedule this command
 to run at a regular interval. To create a node list, run
 
 ```shell

eth/handler.go

@@ -287,7 +287,7 @@ func (h *handler) runEthPeer(peer *eth.Peer, handler eth.Handler) error {
 	}
 	// Ignore max peer and max inbound peer check if:
 	//  - this is a trusted or statically dialed peer
-	//  - the peer is from from the proxy server (e.g. peers connected to this node's internal network interface)
+	//  - the peer is from the proxy server (e.g. peers connected to this node's internal network interface)
 	//  - forcePeer is true
 	if !forcePeer {
 		// KJUE - Remove the server not nil check after restoring peer check in server.go

signer/core/signed_data.go

@@ -242,7 +242,7 @@ func (api *SignerAPI) EcRecover(ctx context.Context, data hexutil.Bytes, sig hex
 	// addr = ecrecover(hash, signature)
 	//
 	// Note, the signature must conform to the secp256k1 curve R, S and V values, where
-	// the V value must be be 27 or 28 for legacy reasons.
+	// the V value must be 27 or 28 for legacy reasons.
 	//
 	// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
 	if len(sig) != 65 {