md5sum, sha*sum: improve help for --check related options

* src/md5sum.c (usage): s/three/four/ in the message pertaining
to the --check related options.  Also clarify that --strict
is just significant for the formatting of the checksum lines.
Also since we're changing both strings, move the --strict description
in with the description of the other options and order alphabetically.
* THANKS.in: Added reporter: Daniel Mach

THANKS.in

@@ -138,6 +138,7 @@ Dameon G. Rogers                    dgr03@uark.edu
 Dan Hagerty                         hag@gnu.ai.it.edu
 Dan Pascu                           dan@services.iiruc.ro
 Daniel Bergstrom                    noa@melody.se
+Daniel Mach                         dmach@redhat.com
 Daniel P. Berrangé                  berrange@redhat.com
 Daniel Stavrovski                   d@stavrovski.net
 Daniel Tschinder                    daniel.tschinder@project-a.com

src/md5sum.c

@@ -194,14 +194,12 @@ With no FILE, or when FILE is -, read standard input.\n\
 "), stdout);
       fputs (_("\
 \n\
-The following three options are useful only when verifying checksums:\n\
+The following four options are useful only when verifying checksums:\n\
       --quiet          don't print OK for each successfully verified file\n\
       --status         don't output anything, status code shows success\n\
+      --strict         exit non-zero for improperly formatted checksum lines\n\
   -w, --warn           warn about improperly formatted checksum lines\n\
 \n\
-"), stdout);
-      fputs (_("\
-      --strict         with --check, exit non-zero for any invalid input\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);