docs: Fixup cpudist pid example in man page
P prints all by process id
p prints specific process id
also fixed port num in example
@@ -68,9 +68,9 @@ Print 1 second summaries, using milliseconds as units for the histogram, and inc
#
.B cpudist \-mT 1
.TP
-Trace PID 186 only, 1 second summaries:
+Trace PID 185 only, 1 second summaries:
#
-.B cpudist -P 185 1
+.B cpudist -p 185 1
.SH FIELDS
.TP
usecs
