Merge pull request 'added explanation about stdout' (#487) from i481-stdout-explanation into main

Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/487

exercises/026_hello2.zig

@@ -30,3 +30,11 @@ pub fn main(init: std.process.Init) !void {
     // We just learned of a single statement which can accomplish this.
     stdout.print("Hello world!\n", .{});
 }
+
+// Now you must be thinking "Why would I need to do this instead of good
+// old 'std.debug.print()'?", but here's what you need to understand:
+// 'std.debug.print()' prints its output to stderr, while the stdout_writer
+// approach prints to stdout.
+// A common practice is to pipe output of a command to other commands,
+// and in order for the piping to work, those commands expect thier input
+// to come from stdout, not stderr.

exercises/108_threading2.zig

@@ -104,6 +104,11 @@ fn thread_pi(pi: *f64, begin: u64, count: u64) !void {
 // is created. Otherwise the debug functions slow down the speed
 // to such an extent that seconds become minutes during execution.
 //
+// You can use the following command to build and run this
+// exercise with the "ReleaseFast" flag:
+//
+//      zig run exercises/108_threading2.zig -O ReleaseFast
+//
 // And you should remove the formatting restriction in "print",
 // otherwise you will not be able to see the additional digits.
 //

patches/patches/026_hello2.patch

@@ -1,9 +1,11 @@
---- exercises/026_hello2.zig	2026-01-09 22:51:45.803358789 +0100
+--- exercises/026_hello2.zig	2026-07-01 16:27:18.674459266 +0200
-+++ answers/026_hello2.zig	2026-01-09 22:50:46.016166527 +0100
++++ answers/026_hello2.zig	2026-07-01 16:27:08.579220702 +0200
-@@ -28,5 +28,5 @@
+@@ -28,7 +28,7 @@
      // to be able to pass it up as a return value of main().
      //
      // We just learned of a single statement which can accomplish this.
 -    stdout.print("Hello world!\n", .{});
 +    try stdout.print("Hello world!\n", .{});
  }
+ 
+ // Now you must be thinking "Why would I need to do this instead of good