fixup!: add a comment

Author: himself65

tools/msvs/find_nasm.cmd

@@ -17,6 +17,7 @@ exit /b 1
 
 :find-nasm
 set p=%~1
+:: Remove the last nine characters, which are "\nasm.exe"
 set p=%p:~0,-9%
 set "Path=%Path%;%p%"
 set p=