Fix capitalization of messages, per style guide

src/interfaces/libpq/fe-auth.c

@@ -426,7 +426,7 @@ pg_SASL_init(PGconn *conn, int payloadlen)
 		!conn->ssl_in_use)
 	{
 		printfPQExpBuffer(&conn->errorMessage,
-						  libpq_gettext("Channel binding required, but SSL not in use\n"));
+						  libpq_gettext("channel binding required, but SSL not in use\n"));
 		goto error;
 	}
 
@@ -833,13 +833,13 @@ check_expected_areq(AuthRequest areq, PGconn *conn)
 				if (!pg_fe_scram_channel_bound(conn->sasl_state))
 				{
 					printfPQExpBuffer(&conn->errorMessage,
-									  libpq_gettext("Channel binding required, but server authenticated client without channel binding\n"));
+									  libpq_gettext("channel binding required, but server authenticated client without channel binding\n"));
 					result = false;
 				}
 				break;
 			default:
 				printfPQExpBuffer(&conn->errorMessage,
-								  libpq_gettext("Channel binding required but not supported by server's authentication request\n"));
+								  libpq_gettext("channel binding required but not supported by server's authentication request\n"));
 				result = false;
 				break;
 		}

src/test/ssl/t/002_scram.pl

@@ -86,7 +86,7 @@ else
 test_connect_fails(
 	$common_connstr,
 	"user=md5testuser channel_binding=require",
-	qr/Channel binding required but not supported by server's authentication request/,
+	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
 # Now test with auth method 'cert' by connecting to 'certdb'. Should
@@ -96,7 +96,7 @@ chmod 0600, "ssl/client_tmp.key";
 test_connect_fails(
 	"sslcert=ssl/client.crt sslkey=ssl/client_tmp.key hostaddr=$SERVERHOSTADDR",
 	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/Channel binding required, but server authenticated client without channel binding/,
+	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
 
 done_testing($number_of_tests);