remove git markers

etc/doc/tutorial/en/09.4-Ticking.md

@@ -11,16 +11,16 @@ sleeps for rhythms, chord progressions, timbral variations, etc. etc.
 Sonic Pi provides a *very* handy tool for working with rings within
 `live_loop`s. It's called the tick system. In the section about the rings we were talking about the counter that is constantly increasing, like a current beat number. Tick just implements this idea. It provides you with the ability to *tick through rings*. Let's look at an example:
 
-+```
-+counter = 0
-+live_loop :arp do
-+  play (scale :e3, :minor_pentatonic)[counter], release: 0.1
-+  counter += 1
-+  sleep 0.125
-+end
-+```
-+
-+This is equivalent to:
+```
+counter = 0
+live_loop :arp do
+  play (scale :e3, :minor_pentatonic)[counter], release: 0.1
+  counter += 1
+  sleep 0.125
+end
+```
+
+This is equivalent to:
 
 ```
 live_loop :arp do