Unified .md style

There were some tabs and broken Indentations which I corrected and converted to spaces.

doc/Send-requirements.md

@@ -458,6 +458,7 @@ Request:
     }
     
 Response:
+
     {
         "r_hash": "...",     //string,
         "pay_req": "...",    //string, a bare-bones invoice for a payment within the Lightning Network
@@ -466,6 +467,7 @@ Response:
 			     // Callers to the SubscribeInvoices call can use this to instantly 
 			     // get notified of all added invoices with an add_index greater than this one.
     }
+
 ## GET /getuserinvoices
 
 Returns fees user pays for payments, status of the system, etc.
@@ -475,6 +477,7 @@ Request:
     none
     
 Response:
+
     {
         "r_hash": "...",            //string
         "payment_request": "...",   //string
@@ -483,6 +486,7 @@ Response:
         "amt": ... ,                //int
         "ispaid": ...               //bool
     }
+
 # Data structures
 
 ## Transaction object