textual: standardize the spelling of "superuser"

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>

login-utils/su-common.c

@@ -499,7 +499,7 @@ modify_environment (const struct passwd *pw, const char *shell)
     }
   else
     {
-      /* Set HOME, SHELL, and if not becoming a super-user,
+      /* Set HOME, SHELL, and (if not becoming a superuser)
 	 USER and LOGNAME.  */
       if (change_environment)
         {

sys-utils/renice.1

@@ -83,12 +83,12 @@ PIDs 987 and 32, plus all processes owned by the users daemon and root:
 .TP
 .B "       renice" +1 987 -u daemon root -p 32
 .SH NOTES
-Users other than the super-user may only alter the priority of processes they
+Users other than the superuser may only alter the priority of processes they
 own, and can only monotonically increase their ``nice value'' (for security
 reasons) within the range 0 to
 .BR PRIO_MAX \ (20),
 unless a nice resource limit is set (Linux 2.6.12 and higher).  The
-super-user may alter the priority of any process and set the priority to any
+superuser may alter the priority of any process and set the priority to any
 value in the range
 .BR PRIO_MIN \ (\-20)
 to
@@ -104,7 +104,7 @@ to map user names to user IDs
 .BR getpriority (2),
 .BR setpriority (2)
 .SH BUGS
-Non super-users can not increase scheduling priorities of their own processes,
+Non-superusers cannot increase scheduling priorities of their own processes,
 even if they were the ones that decreased the priorities in the first place.
 .PP
 The Linux kernel (at least version 2.0.0) and linux libc (at least version

term-utils/wall.1

@@ -48,7 +48,7 @@ in users.  The command will cut over 79 character long lines to new lines.
 Short lines are white space padded to have 79 characters.  The command will
 always put carriage return and new line at the end of each line.
 .PP
-Only the super-user can write on the terminals of users who have chosen to
+Only the superuser can write on the terminals of users who have chosen to
 deny messages or are using a program which automatically denies messages.
 .PP
 Reading from a file is refused when the invoker is not superuser and the

term-utils/write.1

@@ -66,7 +66,7 @@ user will see the message
 .B EOF
 indicating that the conversation is over.
 .PP
-You can prevent people (other than the super-user) from writing to you with
+You can prevent people (other than the superuser) from writing to you with
 the
 .BR mesg (1)
 command.  Some commands, for example