Tutorial - remove unecessary genderisation

Author: samaaron

etc/doc/tutorial/06-FX.md

@@ -21,7 +21,7 @@ If all of this sounds a bit complicated, don't worry. Once you play
 around with it a little, it will all become quite clear. Before you do
 though, a simple analogy is that of guitar FX pedals. There are many
 kinds of FX pedals you can buy. Some add reverb, others distort etc. A
-guitarist will plug his or her guitar into one FX pedal -
+guitarist will plug their guitar into one FX pedal -
 i.e. distortion -, then take another cable and connect (chain) a
 reverb pedal. The output of the reverb pedal can then be plugged into
 the amplifier:

etc/doc/tutorial/A.02-live-coding.md

@@ -8,8 +8,8 @@ with a heady mix of synths and dancing. However something wasn't quite
 right in this nightclub. Projected in bright colours above the DJ booth
 was futuristic text, moving, dancing, flashing. This wasn't fancy
 visuals, it was merely a projection of Sonic Pi running on a Raspberry
-Pi. The occupant of the DJ booth wasn't spinning disks, he was writing,
-editing and evaluating code. Live. This is Live Coding.
+Pi. The occupant of the DJ booth wasn't spinning disks, they wrote,
+edited and evaluated code. Live. This is Live Coding.
 
 ![Sam Aaron Live Coding](../../../etc/doc/images/tutorial/articles/A.02-live-coding/sam-aaron-live-coding.png)