Update ext_flash_notes.md

I think the last advice to backup is important, but the command does not work.
"mem dump p f flash_signature_dump o 262015 l 128" is now "mem dump -f flash_signature_dump -o 262015 -l 128". (OS: Iceman/master/v4.18218)

Signed-off-by: Benjamin Møller <37707273+LupusE@users.noreply.github.com>
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Benjamin Møller 2024-03-09 20:41:48 +01:00 committed by GitHub
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@ -125,5 +125,5 @@ Here below is a sample output of a RDV4 device.
To make a backup of the signature to file:
`mem dump p f flash_signature_dump o 262015 l 128`
`mem dump -f flash_signature_dump -o 262015 -l 128`