remove redundant boolean (#192)

15.md

@@ -40,7 +40,7 @@ Here, `request` is the bolt11 Lightning invoice to be paid, `unit` is the unit t
 
 ## Mint info setting
 
-The settings returned in the info endpoint ([NUT-06][06]) indicate that a mint supports this NUT. The mint MUST indicate each `method` and `unit` that supports `mpp`. It can indicate this in an array of objects for multiple `method` and `unit` pairs and the boolean flag `mpp` set to `true`.
+The settings returned in the info endpoint ([NUT-06][06]) indicate that a mint supports this NUT. The mint MUST indicate each `method` and `unit` that supports mpp. It can indicate this in an array of objects for multiple `method` and `unit` pairs.
 
 `MultipathPaymentSetting` is of the form:
 
@@ -49,8 +49,7 @@ The settings returned in the info endpoint ([NUT-06][06]) indicate that a mint s
   [
     {
       "method": <str>,
-      "unit": <str>,
-      "mpp": <bool>
+      "unit": <str>
     },
     ...
   ]
@@ -65,13 +64,11 @@ Example `MultipathPaymentSetting`:
     "methods": [
       {
         "method": "bolt11",
-        "unit": "sat",
-        "mpp": true
+        "unit": "sat"
       },
       {
         "method": "bolt11",
-        "unit": "usd",
-        "mpp": true
+        "unit": "usd"
       }
     ]
   }