remove {{newline}} as it has no impact at all

Author: wing328

modules/swagger-codegen/src/main/resources/Java/api.mustache

@@ -39,9 +39,9 @@ public class {{classname}} {
   {{#operation}}
   /**
    * {{summary}}
-   * {{notes}}{{newLine}}
-{{#allParams}}{{newLine}}   * @param {{paramName}} {{description}}
-{{/allParams}}{{newLine}}   * @return {{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}{{newLine}}
+   * {{notes}}
+{{#allParams}}   * @param {{paramName}} {{description}}
+{{/allParams}}   * @return {{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}
    */
   public {{#returnType}}{{{returnType}}} {{/returnType}}{{^returnType}}void {{/returnType}}{{nickname}} ({{#allParams}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}) throws ApiException {
     Object postBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}null{{/bodyParam}};