Fix typo

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

@@ -16,7 +16,7 @@
   * We will use bash which is (almost) universaly presnt
     - Steve Jobs did not like the license, but ...
 	  ```shell
-	  brew install bash`
+	  brew install bash
 	  ```
 	  
 	<!-- .element: class="fragment" -->