Merge branch 'doc/update_wifi_info_to_release_3.3+' into 'master'

deleted a note regarding restrictions during sniffer and promiscuous mode

See merge request sdk/ESP8266_RTOS_SDK!1581

Author: donghengqaz

docs/en/api-reference/wifi/esp_wifi.rst

@@ -14,11 +14,6 @@ The WiFi libraries provide support for configuring and monitoring the ESP8266 Wi
 - Scanning for access points (active & passive scanning).
 - Promiscuous mode monitoring of IEEE802.11 WiFi packets.
 
-Important
-^^^^^^^^^
-
-Since the ESP8266 RTOS SDK V3.0, we moved some functions from IRAM to flash, including `malloc` and `free` fucntions, to save more memory.
-In this case, please do not read/write/erase flash during sniffer or promiscuous mode. You need to disable the sniffer or promiscuous mode at first, then read/write/erase flash.
 
 Application Examples
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