okx: REST orderbook depth fix (#1228)

* orderbook depth fix

* more data, more power

* fx splln misteaks

contrib/spellcheck/exclude_lines.txt

@@ -14,6 +14,7 @@
 	currency.GARD:     100,
 	currency.DASHS:      0.01,
 	currency.ALIS:       0.05,
+	currency.MIS:        0.002,
 	const pressXToJSON = `[0,"bu",[4131.85,4131.85]]`
 	wsTradeExecuted                        = "te"
 	wsBalanceUpdate                        = "bu"

exchanges/okx/okx_test.go

@@ -104,7 +104,7 @@ func TestGetTicker(t *testing.T) {
 
 func TestGetOrderBookDepth(t *testing.T) {
 	t.Parallel()
-	_, err := ok.GetOrderBookDepth(context.Background(), "BTC-USDT", 2)
+	_, err := ok.GetOrderBookDepth(context.Background(), "BTC-USDT", 400)
 	if err != nil {
 		t.Error("OKX GetOrderBookDepth() error", err)
 	}

exchanges/okx/okx_types.go

@@ -63,7 +63,7 @@ const (
 	operationLogin       = "login"
 )
 
-// Market Data Endoints
+// Market Data Endpoints
 
 // TickerResponse represents the market data endpoint ticker detail
 type TickerResponse struct {

exchanges/okx/okx_wrapper.go

@@ -485,7 +485,7 @@ func (ok *Okx) UpdateOrderbook(ctx context.Context, pair currency.Pair, assetTyp
 		return nil, errIncompleteCurrencyPair
 	}
 	instrumentID = format.Format(pair)
-	orderbookNew, err = ok.GetOrderBookDepth(ctx, instrumentID, 0)
+	orderbookNew, err = ok.GetOrderBookDepth(ctx, instrumentID, 400)
 	if err != nil {
 		return book, err
 	}