dm-verity: Remove usage of integrity

There is a difference between dm-verity and dm-integrity.  Remove
usage of integrity from verity documentation in man pages and
target files.

src/veritysetup/veritysetup-generator.c

@@ -100,7 +100,7 @@ static int create_device(void) {
 
         fprintf(f,
                 "[Unit]\n"
-                "Description=Integrity Protection Setup for %%I\n"
+                "Description=Verity Protection Setup for %%I\n"
                 "Documentation=man:systemd-veritysetup-generator(8) man:systemd-veritysetup@.service(8)\n"
                 "SourcePath=/proc/cmdline\n"
                 "DefaultDependencies=no\n"

src/veritysetup/veritysetup.c

@@ -30,7 +30,7 @@ static int help(void) {
 
         printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH [OPTIONS]\n"
                "%s detach VOLUME\n\n"
-               "Attach or detach an integrity protected block device.\n"
+               "Attach or detach a verity protected block device.\n"
                "\nSee the %s for details.\n",
                program_invocation_short_name,
                program_invocation_short_name,