man: fix a reference to runqlat in runqslower man page
The runqslower man page obviously derived from the man page of
runqlat. It seems that a reference to runqlat in the NAME section has
been overlooked.
.TH runqslower 8 "2016-02-07" "USER COMMANDS"
.SH NAME
-runqlat \- Trace long process scheduling delays.
+runqslower \- Trace long process scheduling delays.
.SH SYNOPSIS
.B runqslower [\-p PID] [min_us]
.SH DESCRIPTION
