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.

2006/birken/README.md

@@ -23,7 +23,7 @@ For more detailed information see [2006 birken in bugs.md](/bugs.md#2006-birken)
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2006/borsanyi/README.md

@@ -23,7 +23,7 @@ For more detailed information see [2006 borsanyi in bugs.md](/bugs.md#2006-borsa
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./borsanyi ioccc@example.com > example.gif

2006/grothe/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./grothe 65000000 10000000 1344 < twinkle.txt

2006/hamre/README.md

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

2006/meyer/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./meyer [SEED]

2006/monge/README.md

@@ -29,7 +29,7 @@ For more detailed information see [2006 monge in bugs.md](/bugs.md#2006-monge).
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./monge "z = 0" "z = z*z*z + c; Abs2(z) < 4"

2006/sloane/README.md

@@ -16,7 +16,7 @@ code](#original-code) below.
 ```
 
 
-### Try:
+## Try:
 
 The alternate version, which we recommend that you use in order to see what is
 happening with modern systems, and to not flash too quickly, which can be

2006/stewart/README.md

@@ -27,7 +27,7 @@ NOTE: you cannot specify a different width from height; it's one number.
 NOTE: `convert(1)` belongs to [ImageMagick](https://imagemagick.org/index.php).
 
 
-### Try:
+## Try:
 
 ```sh
 ./stewart 400 1000000 maze > maze.xbm

2006/sykes1/README.md

@@ -25,7 +25,7 @@ For more detailed information see [2006 sykes1 in bugs.md](/bugs.md#2006-sykes1)
 Next point your browser to the file: `sykes1.html`.
 
 
-### Try:
+## Try:
 
 ```sh
 ./sykes1 10

2006/sykes2/README.md

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

2006/toledo1/README.md

@@ -14,7 +14,7 @@ make
 where `[0-9][0-9]` is a two digit number.
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

2006/toledo2/README.md

@@ -31,7 +31,7 @@ below section, it is supposed to crash on termination though some noted this
 does not seem to happen in macOS or linux in 2023.
 
 
-### Try:
+## Try:
 
 ```sh
 ./toledo2

2006/toledo3/README.md

@@ -16,7 +16,7 @@ tested with Windows.  See [alternate code](#alternate-code) below.
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./toledo3 1