fix ccxt#17749: watchOHLCV don't have timeFrame param in docs

fix: added `timeFrame` param to `watchOHLCV` examples for js and python

Author: yzh-pelle

doc/ccxt.pro.manual.rst

@@ -1456,7 +1456,7 @@ If your application is not very time-critical, you can still subscribe to OHLCV
    if (exchange.has['watchOHLCV']) {
        while (true) {
            try {
-               const candles = await exchange.watchOHLCV (symbol, since, limit, params)
+               const candles = await exchange.watchOHLCV (symbol, timeframe, since, limit, params)
                console.log (new Date (), candles)
            } catch (e) {
                console.log (e)
@@ -1472,7 +1472,7 @@ If your application is not very time-critical, you can still subscribe to OHLCV
    if exchange.has['watchOHLCV']:
        while True:
            try:
-               candles = await exchange.watch_ohlcv(symbol, since, limit, params)
+               candles = await exchange.watch_ohlcv(symbol, timeframe, since, limit, params)
                print(exchange.iso8601(exchange.milliseconds()), candles)
            except Exception as e:
                print(e)