docs: add note in echo.c PrintHelp()

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Userspace/coreutils/src/admin.c

@@ -17,13 +17,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <time.h>
-#include <errno.h>
 
 int main(int argc, char *argv[])
 {

Userspace/coreutils/src/echo.c

@@ -24,6 +24,14 @@
 
 void PrintHelp()
 {
+	/**
+	 * POSIX specification for echo specifies that
+	 * "Implementations shall not support any options."
+	 * but i will do this anyway.
+	 *
+	 * https://pubs.opengroup.org/onlinepubs/9799919799/utilities/echo.html
+	 */
+
 	printf("Usage: echo [OPTION]... [STRING]...\n");
 	printf("Echo the STRING(s) to standard output.\n\n");
 	printf("  -n          do not output the trailing newline\n");