fix

docs.it4i/software/tools/singularity-it4i.md

 # Singularity on IT4Innovations
 
 On clusters we have different versions of operating systems singularity images. Below you see the available operating systems singularity images.
+
 Our images bootstrap, wrappers, features are [here](https://code.it4i.cz/sccs/it4i-singularity).
 
 ```console
@@ -27,11 +28,11 @@ For current information on available singularity images, refer to the `ml av` an
 * Fedora
 
 !!! note
-    We support graphical cards on Anselm singularity image and support Intel Xeon Phi cards on Salomon images. (OS/Version-[none|GPU|MIC])
+    We support graphical cards on Anselm singularity image and support Intel Xeon Phi cards on Salomon images. (OS/Version[none|-GPU|-MIC])
 
 ## IT4Innovations Wrappers
 
-For using modules we prepared special wrappers
+For using our singularity images we prepared special wrappers:
 
 * image-exec
 * image-mpi
@@ -46,7 +47,7 @@ Open image and run command into image.
 ```console
 $ ml CentOS/7.3
 Your image of CentOS/7.3 is at location: /home/login/.singularity/images/CentOS-7.3_20180220104046.img
-image-exec cat /etc/centos-release
+$ image-exec cat /etc/centos-release
 CentOS Linux release 7.3.1708 (Core)
 ```
 
@@ -56,11 +57,11 @@ MPI wrapper. More in the chapter [Examples MPI](#mpi)
 
 **image-run**
 
-Run subscript into image.
+Run subscript inside image.
 
 **image-shell**
 
-Start shell into image.
+Start shell inside image.
 
 ```console
 $ ml CentOS/7.3
@@ -101,21 +102,8 @@ $ ml CentOS/6.9
 Your image of CentOS/6.9 is at location: /home/login/.singularity/images/CentOS-6.9_20180220133305.img
 ```
 
-!!! note
-    First usage image copy image from /apps/all/OS/... to your /home (.singularity/images)
-
-For GPU and MIC images
-
-```console
-$ ml CentOS/6.9-GPU
-```
-
-```console
-$ ml CentOS/6.9-MIC
-```
-
-!!! note
-    For the GPU image, you must allocate node with GPU card and for the MIC image, you must allocate node with the Intel Xeon Phi cards.
+!!! tip
+    First usage module with singularity image, copy singularity image from /apps/all/OS/... to your /home (.singularity/images)
 
 ### Intel Xeon Phi Cards - MIC
 
@@ -144,9 +132,6 @@ int main() {
     nthreads = std::thread::hardware_concurrency();
     printf("Hello world from MIC, #of cores: %d\n",nthreads);
   }
-
-
-
 }
 ```
 
@@ -222,7 +207,7 @@ By calling `mpirun` outside the container, we solve several very complicated wor
 
 In the end, we do not gain anything by calling `mpirun` from within the container except for increasing the complexity levels and possibly losing out on some added performance benefits (e.g. if a container wasn’t built with the proper OFED as the host).
 
-### MPI Inside Image
+#### MPI Inside Image
 
 ```console
 $ ml CentOS/6.9
@@ -236,7 +221,7 @@ Singularity CentOS-6.9_20180220092823.img:~> mpirun hostname | wc -l
 !!! warning
     You allocate two nodes, but MPI inside image use only one node.
 
-### MPI Outside Image
+#### MPI Outside Image
 
 ```console
 $ ml CentOS/6.9