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.

1995/cdua/README.md

@@ -33,7 +33,7 @@ For more detailed information see [1995 cdua in bugs.md](/bugs.md#1995-cdua).
 ```
 
 
-### Try:
+## Try:
 
 
 ```sh

1995/dodsond1/README.md

@@ -12,7 +12,7 @@ make all
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./dodsond1 < README.md

1995/esde/README.md

@@ -14,7 +14,7 @@ make all
 where data-file contains lines of < 255 chars in length.
 
 
-### Try:
+## Try:
 
 ```sh
 ./try.sh

1995/garry/README.md

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

1995/heathbar/README.md

@@ -14,7 +14,7 @@ make all
 where num is a non-negative number.
 
 
-### Try:
+## Try:
 
 ```sh
 ./heathbar 4253 2281

1995/leo/README.md

@@ -14,7 +14,7 @@ make all
 See the author's information below on these details.
 
 
-### Try:
+## Try:
 
 ```sh
 ./leo 1 | cat - /dev/tty | gs -

1995/savastio/README.md

@@ -13,7 +13,7 @@ make all
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 echo 42 | ./savastio

1995/schnitzi/README.md

@@ -12,7 +12,7 @@ make all
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./schnitzi 24

1995/vanschnitz/README.md

@@ -26,7 +26,7 @@ For more detailed information see [1995 vanschnitz in bugs.md](/bugs.md#1995-van
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 make clobber all LEVEL=6