Fix slides/intro_aim.md

2020/2020-02-15_gnuLinuxCourse/slides/intro_aim.md

 # Aims of the Tutorial
   
 * Connect to a GNU/Linux server
-  * SSH, a de-facto standard for secure communication
+  + SSH, a de-facto standard for secure communication
   
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-  * For Windows users, using
+  + For Windows users
 	- [MobaXTerm][1], big, bloated, and freeware (which means that
       sooner, or later they'll ask for your money), but does many other
       useful things besides SSH (and is _recommended by R3_)
-	- [PuTTY][2], simple, ugly, but efficient and open source
+	- [PuTTY][2], simple, ugly, but efficient and open source and does only SSH
 
-  
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-  * For Mac and GNU/Linux users, OpenSSH command line client
+  + For Mac and GNU/Linux users, OpenSSH command line client
   
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+
 * Explore how to use the shell effectively
   * We will use bash which is (almost) universaly present
     - Steve Jobs did not like the license, but ...
 	  ```shell
 	  brew install bash
 	  ```
-	  
-	<!-- .element: class="fragment" -->		
+     
+	<!-- .element: class="fragment" -->
+
+  <!-- .element: class="fragment" -->
 
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