fix standard headers and header spacing in winner README.md files

2019/duble/README.md

@@ -3,6 +3,7 @@
 Etienne Duble\
 <https://lig-membres.imag.fr/duble>
 
+
 ## To build:
 
 ```sh
@@ -10,7 +11,7 @@ make
 ```
 
 
-### Bugs and (Mis)features
+### Bugs and (Mis)features:
 
 The current status of this entry is:
 
@@ -27,7 +28,8 @@ For more detailed information see [2019 duble in bugs.md](/bugs.md#2019-duble).
 ./prog file
 ```
 
-## Try:
+
+### Try:
 
 ```sh
 ./prog /tmp/drawing
@@ -86,11 +88,13 @@ make alt
 
 Use `prog.alt` as you would `prog` above.
 
+
 ## Judges' remarks:
 
 After starting the program, use the cursor keys, then try some modes, like `p`
 or `l` (they toggle).
 
+
 ## Author's remarks:
 
 ### Introduction:
@@ -223,6 +227,7 @@ and it works on macOS too!
 I must confess it was challenging to remain below the size limit with this little
 change.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.