Replaced parentheses in hyperparameter_optimization.md by %28 and %29.

doc.zih.tu-dresden.de/docs/software/hyperparameter_optimization.md

@@ -272,7 +272,7 @@ this configuration file can be modified directly without using the GUI.
 
 A screenshot of the GUI, including a properly configuration for the MNIST fashion example is shown
 below.  The GUI, in which the below displayed values are already entered, can be reached
-[here](https://imageseg.scads.ai/omnioptgui/?maxevalserror=5&mem_per_worker=1000&number_of_parameters=3&param_0_values=10%2C50%2C100&param_1_values=8%2C16%2C32&param_2_values=10%2C15%2C30&param_0_name=out-layer1&param_1_name=batchsize&param_2_name=batchsize&account=&projectname=mnist_fashion_optimization_set_1&partition=alpha&searchtype=tpe.suggest&param_0_type=hp.choice&param_1_type=hp.choice&param_2_type=hp.choice&max_evals=1000&objective_program=bash%20%3C%2Fpath%2Fto%2Fwrapper-script%2Frun-mnist-fashion.sh%3E%20--out-layer1%3D(%24x_0)%20--batchsize%3D(%24x_1)%20--epochs%3D(%24x_2)&workdir=%3C%2Fscratch%2Fws%2Fomniopt-workdir%2F%3E).
+[here](https://imageseg.scads.ai/omnioptgui/?maxevalserror=5&mem_per_worker=1000&number_of_parameters=3&param_0_values=10%2C50%2C100&param_1_values=8%2C16%2C32&param_2_values=10%2C15%2C30&param_0_name=out-layer1&param_1_name=batchsize&param_2_name=batchsize&account=&projectname=mnist_fashion_optimization_set_1&partition=alpha&searchtype=tpe.suggest&param_0_type=hp.choice&param_1_type=hp.choice&param_2_type=hp.choice&max_evals=1000&objective_program=bash%20%3C%2Fpath%2Fto%2Fwrapper-script%2Frun-mnist-fashion.sh%3E%20--out-layer1%3D%28%24x_0%29%20--batchsize%3D%28%24x_1%29%20--epochs%3D%28%24x_2%29&workdir=%3C%2Fscratch%2Fws%2Fomniopt-workdir%2F%3E).
 
 Please modify the paths for `objective program` and `workdir` according to your needs.