[BAEL-2255] - fix formatting

core-java/src/main/java/com/baeldung/bufferedreader/BufferedReaderExample.java

@@ -21,7 +21,9 @@ public class BufferedReaderExample {
 
     public String readAllLines2(BufferedReader reader) {
         StringBuilder content = new StringBuilder();
-        reader.lines().forEach(line -> content.append(line).append(System.lineSeparator()));
+        reader.lines()
+            .forEach(line -> content.append(line)
+                .append(System.lineSeparator()));
         return content.toString();
     }