code: public JavadocComment toComment(String indentation) {
          for (char c : indentation.toCharArray()) {
              if (!Character.isWhitespace(c)) {
                  throw new IllegalArgumentException("The indentation string should be composed only by whitespace characters");
              }
          }
          StringBuilder sb = new StringBuilder();
          sb.append(EOL);
          final String text = toText();
          if (!text.isEmpty()) {
              for (String line : text.split(EOL)) {
                  sb.append(indentation);
                  sb.append(" * ");
                  sb.append(line);
                  sb.append(EOL);
              }
          }
          sb.append(indentation);
          sb.append(" ");
          return new JavadocComment(sb.toString());
      }
docs: Create a JavadocComment, by formatting the text of the Javadoc using the given indentation.