3623 kstat must accept partial stat specification

@@ -15,11 +15,11 @@
 .fi
 
 .LP
 .nf
 \fBkstat\fR [\fB-Cjlpq\fR] [\fB-T\fR u | d ] [\fB-c\fR \fIclass\fR]
-     [\fImodule\fR:\fIinstance\fR:\fIname\fR:\fIstatistic\fR]...
+     [\fImodule\fR[:\fIinstance\fR[:\fIname\fR[:\fIstatistic\fR]]]]...
      [interval [count]]
 .fi
 
 .SH DESCRIPTION
 .sp