Update market-hours.mdx (#663)

Adding Emerging Markets FX section

Author: benpyth

pages/price-feeds/market-hours.mdx

@@ -8,6 +8,7 @@ Pyth price feeds follow the [traditional market hours](https://www.cmegroup.com/
 | EU Equities | Paris, Amsterdam, Ireland: Every weekday from 9AM CET to 5.30PM CET | Markets are closed on weekends, and follow [Euronext Holidays & Trading Hours](https://live.euronext.com/en/resources/trading-hours-holidays) |
 | UK Equities | Every weekday from 8AM GMT to 4.30PM GMT | Markets are closed on weekends, and follow [LSE Holidays & Trading Hours](https://www.londonstockexchange.com/equities-trading/business-days) |
 | FX | From Sunday 5PM ET to Friday 5PM ET | Daily maintenance window applies from 5PM ET to 6PM ET, Monday to Thursday. Trading continues during most US holidays |
+| Emerging Markets FX | From Sunday 6PM ET to Friday 5PM ET | Market liquidity may be limited at the start of the trading week, which can lead to wider confidence intervals for certain currency pairs. Daily maintenance window applies from 5PM ET to 6PM ET, Monday to Thursday and follow [CME holiday closures](https://www.cmegroup.com/tools-information/holiday-calendar.html) |
 | Metals | From Sunday 6PM ET to Friday 5PM ET | Daily maintenance window applies from 5PM ET to 6PM ET, Monday to Thursday. Spot gold and silver trading also follow [CME holiday closures](https://www.cmegroup.com/tools-information/holiday-calendar.html)|
 | Rates | Every weekday from 8AM ET to 5PM ET | Markets are closed on weekends, and follow [NYSE Holidays & Trading Hours](https://www.nyse.com/markets/hours-calendars) |
 | Commodities | WTI: From Sunday 6PM ET to Friday 5PM ET | Daily maintenance window applies from 5PM ET to 6PM ET and follow [CME holiday closures](https://www.cmegroup.com/tools-information/holiday-calendar.html)|