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

2020/endoh1/README.md

@@ -4,19 +4,22 @@ Yusuke Endoh
 <https://github.com/mame/>\
 Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 
+
 ## To build:
 
 ```sh
 make
 ```
 
+
 ## To use:
 
 ```sh
 ./prog
 ```
 
-## Try:
+
+### Try:
 
 ```sh
 
@@ -43,6 +46,7 @@ make alt
 
 Use `prog.alt` as you would `prog` above.
 
+
 ## Judges' remarks:
 
 When playing Minesweeper, a misclick might ruin a game, so why not leave the
@@ -56,6 +60,7 @@ encounter any problems?
 The submission was in violation of the "2053" size rule by one character, likely
 a late typo. It was easy to fix.
 
+
 ## Author's remarks:
 
 ### Semi-automatic Minesweeper:
@@ -184,6 +189,7 @@ Ilya Kurdyukov also pointed out a warning "ignoring return value of 'fscanf'" on
 
 Don Yang (omoikane) contributed another example map "megumin.txt" which is the Explosion Arch-Wizard.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.