Fix heading level of 'Try' section

It was agreed to be '## Try:' but there were many files where it was
'### Try:'. This has been corrected.

2001/anonymous/README.md

@@ -32,7 +32,7 @@ For more detailed information see [2001 anonymous in bugs.md](/bugs.md#2001-anon
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2001/bellard/README.md

@@ -24,7 +24,7 @@ For more detailed information see [2001 bellard in bugs.md](/bugs.md#2001-bellar
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./bellard bellard.otccex.c

2001/cheong/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2001/coupard/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 If you have access to `/dev/audio` or `/dev/sound/dsp`:
 

2001/dgbeards/README.md

@@ -48,7 +48,7 @@ make alt
 ```
 
 
-### Try:
+## Try:
 
 See if you can figure out how to make the computer always lose ('win' :-) ).
 It's a very simple thing to do. Read the author's remarks for clues.

2001/herrmann1/README.md

@@ -28,7 +28,7 @@ stage and as such if you wish to see that part like it was designed you will
 need an older compiler perhaps gcc 2.95.
 
 
-### Try:
+## Try:
 
 ```sh
 ./herrmann1.sh 'prg=herrmann1.times2'

2001/herrmann2/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2001/kev/README.md

@@ -30,7 +30,7 @@ For more detailed information see [2001 kev in bugs.md](/bugs.md#2001-kev).
 NOTE: each player's paddle is at the bottom and the opponent at the top.
 
 
-### Try:
+## Try:
 
 ```sh
 ./kev		    # in one terminal

2001/ollinger/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./ollinger 1000 | cut -c -200

2001/rosten/README.md

@@ -28,7 +28,7 @@ program.  Use at your own risk.
 NOTE: number is floating point.
 
 
-### Try:
+## Try:
 
 ```sh
 ./rosten 1.03

2001/schweikh/README.md

@@ -38,7 +38,7 @@ That's not a bug, that's a feature.
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2001/westley/README.md

@@ -34,7 +34,7 @@ echo foo | ./westley 2>/dev/null
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh