Update man pages (#3291)

Author: UdjinM6

doc/man/dash-qt.1

@@ -69,6 +69,10 @@ Do not keep transactions in the mempool longer than <n> hours (default:
 .IP
 Whether to save the mempool on shutdown and load on restart (default: 1)
 .HP
+\fB\-syncmempool\fR
+.IP
+Sync mempool from other nodes on start (default: 1)
+.HP
 \fB\-blockreconstructionextratxn=\fR<n>
 .IP
 Extra transactions to keep in memory for compact block reconstructions
@@ -561,7 +565,7 @@ Use N separate masternodes for each denominated input to mix funds
 .HP
 \fB\-privatesendamount=\fR<n>
 .IP
-Keep N DASH mixed (2\-21000000, default: 1000)
+Target PrivateSend balance (2\-21000000, default: 1000)
 .HP
 \fB\-privatesenddenoms=\fR<n>
 .IP

doc/man/dashd.1

@@ -74,6 +74,10 @@ Do not keep transactions in the mempool longer than <n> hours (default:
 .IP
 Whether to save the mempool on shutdown and load on restart (default: 1)
 .HP
+\fB\-syncmempool\fR
+.IP
+Sync mempool from other nodes on start (default: 1)
+.HP
 \fB\-blockreconstructionextratxn=\fR<n>
 .IP
 Extra transactions to keep in memory for compact block reconstructions
@@ -562,7 +566,7 @@ Use N separate masternodes for each denominated input to mix funds
 .HP
 \fB\-privatesendamount=\fR<n>
 .IP
-Keep N DASH mixed (2\-21000000, default: 1000)
+Target PrivateSend balance (2\-21000000, default: 1000)
 .HP
 \fB\-privatesenddenoms=\fR<n>
 .IP