Use a platform-specific line separator

See gh-4707

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/authserver/OAuth2AuthorizationServerConfiguration.java

@@ -147,7 +147,7 @@ public class OAuth2AuthorizationServerConfiguration
 			String prefix = "security.oauth2.client";
 			boolean defaultSecret = this.credentials.isDefaultSecret();
 			logger.info(String.format(
-					"Initialized OAuth2 Client\n\n%s.clientId = %s\n%s.secret = %s\n\n",
+					"Initialized OAuth2 Client%n%n%s.clientId = %s%n%s.secret = %s%n%n",
 					prefix, this.credentials.getClientId(), prefix,
 					defaultSecret ? this.credentials.getClientSecret() : "****"));
 		}

spring-boot-cli/src/main/java/org/springframework/boot/cli/command/CommandRunner.java

@@ -279,14 +279,14 @@ public class CommandRunner implements Iterable<Command> {
 			if (!isOptionCommand(command) && !isHiddenCommand(command)) {
 				String usageHelp = command.getUsageHelp();
 				String description = command.getDescription();
-				Log.info(String.format("\n  %1$s %2$-15s\n    %3$s", command.getName(),
+				Log.info(String.format("%n  %1$s %2$-15s%n    %3$s", command.getName(),
 						(usageHelp == null ? "" : usageHelp),
 						(description == null ? "" : description)));
 			}
 		}
 		Log.info("");
 		Log.info("Common options:");
-		Log.info(String.format("\n  %1$s %2$-15s\n    %3$s", "-d, --debug",
+		Log.info(String.format("%n  %1$s %2$-15s%n    %3$s", "-d, --debug",
 				"Verbose mode",
 				"Print additional status information for the command you are running"));
 		Log.info("");