Redo of PR#5345. Fixed spelling and typographical errors found by CodeSpell.

Signed-off-by: Shaun Case <warmsocks@gmail.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/programs/test/zeroize.c b/programs/test/zeroize.c
index a44099d..d6e5561 100644
--- a/programs/test/zeroize.c
+++ b/programs/test/zeroize.c
@@ -63,7 +63,7 @@
 
     if( argc != 2 )
     {
-        mbedtls_printf( "This program takes exactly 1 agument\n" );
+        mbedtls_printf( "This program takes exactly 1 argument\n" );
         usage();
         mbedtls_exit( exit_code );
     }