'comments' -> 'remarks' in all README.md files

As in

    sgit -e 's/\([Aa]uthor.*\)comments/\1remarks/g' -e 's/\([Jj]udge.*\)comments/\1remarks/g' '*README.md'

2019/yang/README.md

@@ -52,12 +52,12 @@ cat a b c d e | ./prog | diff - prog.c
 ./prog violet.c | ruby violet.c
 ```
 
-## Judges' comments:
+## Judges' remarks:
 
 Do you understand how this program works?  You may have to go over and over the
 output again.
 
-## Author's comments:
+## Author's remarks:
 
 ### Summary: