Improve instructions.

build.zig

@@ -523,14 +523,15 @@ const ZiglingStep = struct {
         const path = self.exercise.main_file;
         const key = self.exercise.key();
 
-        print("\n{s}Edit exercises/{s} and run this again.{s}", .{
+        print("\n{s}Edit exercises/{s} and run 'zig build' again.{s}\n", .{
             red_text, path, reset_text,
         });
 
         const format =
             \\
-            \\{s}To continue from this zigling, use this command:{s}
+            \\{s}To compile only this exercise, you can also use this command:{s}
-            \\    {s}zig build -Dn={s}{s}
+            \\{s}zig build -Dn={s}{s}
+            \\
             \\
         ;
         print(format, .{ red_text, reset_text, bold_text, key, reset_text });
@@ -665,7 +666,7 @@ const exercises = [_]Exercise{
     .{
         .main_file = "001_hello.zig",
         .output = "Hello world!",
-        .hint = "DON'T PANIC!\nRead the error above.\nSee how it has something to do with 'main'?\nOpen up the source file as noted and read the comments.\nYou can do this!",
+        .hint = "DON'T PANIC!\nRead the error above.\nSee how it has something to do with 'main'?\nOpen up the source file as noted and read the comments.\nYou can do this!\n",
     },
     .{
         .main_file = "002_std.zig",