set unescapedDescription and added post param method for request body.

Author: HugoMario

src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java

@@ -2470,6 +2470,7 @@ public CodegenParameter fromRequestBody(RequestBody body, String name, Schema sc
         codegenParameter.baseName = REQUEST_BODY_NAME;
         codegenParameter.paramName = REQUEST_BODY_NAME;
         codegenParameter.description = body.getDescription();
+        codegenParameter.unescapedDescription = body.getDescription();
         codegenParameter.required = body.getRequired() != null ? body.getRequired() : Boolean.FALSE;
         codegenParameter.getVendorExtensions().put(CodegenConstants.IS_BODY_PARAM_EXT_NAME, Boolean.TRUE);
 
@@ -2566,6 +2567,7 @@ else if (schema instanceof BinarySchema) {
             }
         }
         setParameterExampleValue(codegenParameter);
+        postProcessParameter(codegenParameter);
         return codegenParameter;
     }