docs(flashing): Fixed a typo in /docs/en/esptool/flashing-firmware.rst (ESPTOOL-852)

[greendoescode]

Updated the text in this file to fix a typo which was decives, that is now devices.

So sorry about the multiple PRS, I'm not fully up to date with good git practices.

This change fixes the following bug(s): Fixed Spelling Mistake In /docs/en/esptool/flashing-firmware.rst

n/a

I have tested this change with the following hardware & software combinations:

NO TESTING

I have run the esptool.py automated integration tests with this change and the above hardware:

NO TESTING

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[radimkarnis]

All good! You handled it well.