docs update + tool menu name

Author: P-R-O-C-H-Y

boards.txt

@@ -17,7 +17,7 @@ menu.LoRaWanDebugLevel=LoRaWan Debug Level
 menu.LoopCore=Arduino Runs On
 menu.EventsCore=Events Run On
 menu.MemoryType=Memory Type
-menu.EraseFlash=Erase Flash
+menu.EraseFlash=Erase Flash (on upload)
 
 ##############################################################
 ### DO NOT PUT BOARDS ABOVE THE OFFICIAL ESPRESSIF BOARDS! ###

docs/source/guides/tools_menu.rst

@@ -199,7 +199,7 @@ This function is also used to select the core that runs the Arduino events. This
 Erase Flash
 ***********
 
-This function is used to select if the flash memory should be erased before uploading the sketch.
+This option selects the flash memory region to be erased before uploading the new sketch.
 
 * **Only Sketch** - Upload the sketch without erasing all flash contents. (default)
 * **All Flash Contents** - Erase all flash contents before uploading the sketch.