fixup! doc: be explicit (with tests!) on when we don't know amount_msat for listsendpays.

Author: rustyrussell

doc/schemas/listpays.json

@@ -192,7 +192,7 @@
                   "amount_msat": {
                     "type": "msat",
                     "description": [
-                      "The amount of millisatoshi we intended to send to the destination.  This can only be missing in the case of someone manually calling sendonion without the `amount_msat` parameter (which no plugin currently does)."
+                      "The amount of millisatoshi we intended to send to the destination. This can only be missing in the case of someone manually calling sendonion without the `amount_msat` parameter (which no plugin currently does)."
                     ]
                   },
                   "amount_sent_msat": {

doc/schemas/listsendpays.json

@@ -144,7 +144,7 @@
             "amount_msat": {
               "type": "msat",
               "description": [
-                "The amount delivered to destination (if known).  This is not known in the case where sendonion(7) was used to manually initiate a payment without the `amount_msat` parameter."
+                "The amount delivered to destination (if known). This is not known in the case where sendonion(7) was used to manually initiate a payment without the `amount_msat` parameter."
               ]
             },
             "destination": {