doc: Document the `msatoshi` parameter for `sendonion`

doc/lightning-sendonion.7

@@ -3,7 +3,7 @@
 lightning-sendonion - Send a payment with a custom onion packet
 .SH SYNOPSIS
 
-\fBsendonion\fR \fIonion\fR \fIfirst_hop\fR \fIpayment_hash\fR [\fIlabel\fR] [\fIshared_secrets\fR] [\fIpartid\fR] [\fIbolt11\fR]
+\fBsendonion\fR \fIonion\fR \fIfirst_hop\fR \fIpayment_hash\fR [\fIlabel\fR] [\fIshared_secrets\fR] [\fIpartid\fR] [\fIbolt11\fR] [\fImsatoshi\fR]
 
 .SH DESCRIPTION
 
@@ -89,6 +89,10 @@ partial payments with the same \fIpayment_hash\fR\.
 The \fIbolt11\fR parameter, if provided, will be returned in
 \fIwaitsendpay\fR and \fIlistsendpays\fR results\.
 
+
+The \fImsatoshi\fR parameter is used to annotate the payment, and is returned by
+\fIwaitsendpay\fR and \fIlistsendpays\fR\.
+
 .SH RETURN VALUE
 
 On success, an object similar to the output of \fBsendpay\fR will be

doc/lightning-sendonion.7.md

@@ -4,7 +4,7 @@ lightning-sendonion -- Send a payment with a custom onion packet
 SYNOPSIS
 --------
 
-**sendonion** *onion* *first_hop* *payment_hash* \[*label*\] \[*shared_secrets*\] \[*partid*\] \[*bolt11*\]
+**sendonion** *onion* *first_hop* *payment_hash* \[*label*\] \[*shared_secrets*\] \[*partid*\] \[*bolt11*\] \[*msatoshi*\]
 
 DESCRIPTION
 -----------
@@ -78,6 +78,9 @@ partial payments with the same *payment_hash*.
 The *bolt11* parameter, if provided, will be returned in
 *waitsendpay* and *listsendpays* results.
 
+The *msatoshi* parameter is used to annotate the payment, and is returned by
+*waitsendpay* and *listsendpays*.
+
 RETURN VALUE
 ------------