H1: Improve syntax

exercises/h1.md

@@ -113,9 +113,15 @@ In case you use any Unix-based operating system (Linux, GNU/Linux, Apple MacOS,
 
 The following instructions assume that you have only a command line environment and you have a working network connection.
 
-**1.** At first, you need to download an ISO image of your Linux distribution of choice. There are usually two options: download ISO image from a centralized server or download ISO image using torrent protocol. In the following steps, we download Xubuntu 16.04.3 LTS (x86_64).
+**1.** At first, you need to download an ISO image of your Linux distribution of choice. There are usually two options: 
 
-**a. Centralized server:**
+- download ISO image from a centralized server or 
+
+- download ISO image using torrent protocol. 
+
+In the following steps, we download Xubuntu 16.04.3 LTS (x86_64).
+
+**Alternative a. Centralized server:**
 - requires that `wget` command exists in the system
 - download the ISO image with the command:
 
@@ -123,7 +129,7 @@ The following instructions assume that you have only a command line environment
 wget --directory-prefix=$HOME --show-progress http://cdimage.ubuntu.com/xubuntu/releases/16.04.3/release/xubuntu-16.04-desktop-amd64.iso
 ```
 
-**b. Torrent download:**
+**Alternative b. Torrent download:**
 - requires that `transmission-cli` command exists in the system
 - download the ISO image with the command: