Review comments #1.

credentials/tls.go

@@ -137,9 +137,9 @@ func NewTLS(c *tls.Config) TransportCredentials {
 
 // NewClientTLSFromCert constructs TLS credentials from the provided root
 // certificate authority certificate(s) to validate server connections. If
-// certificates to establish the identity of the client need to included in the
-// credentials (eg: for mTLS), use NewTLS instead, where a complete tls.Config
-// can be specified.
+// certificates to establish the identity of the client need to be included in
+// the credentials (eg: for mTLS), use NewTLS instead, where a complete
+// tls.Config can be specified.
 // serverNameOverride is for testing only. If set to a non empty string,
 // it will override the virtual host name of authority (e.g. :authority header
 // field) in requests.
@@ -149,9 +149,9 @@ func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) Transpor
 
 // NewClientTLSFromFile constructs TLS credentials from the provided root
 // certificate authority certificate file(s) to validate server connections. If
-// certificates to establish the identity of the client need to included in the
-// credentials (eg: for mTLS), use NewTLS instead, where a complete tls.Config
-// can be specified.
+// certificates to establish the identity of the client need to be included in
+// the credentials (eg: for mTLS), use NewTLS instead, where a complete
+// tls.Config can be specified.
 // serverNameOverride is for testing only. If set to a non empty string,
 // it will override the virtual host name of authority (e.g. :authority header
 // field) in requests.