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docs: flash encryption: Fix description of behaviour when all bits of FLASH_CRYPT_CNT are set 

Correct behaviour is described in section 25.3.3 Flash Decryption Block of the ESP32 TRM
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Angus Gratton 2018-12-04 12:38:28 +11:00 zatwierdzone przez Angus Gratton
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docs/en/security/flash-encryption.rst
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@ -146,7 +146,7 @@ Limited Updates
Only 4 plaintext serial update cycles of this kind are possible, including the initial encrypted flash.
After the fourth time encryption is disabled, :ref:`FLASH_CRYPT_CNT` has the maximum value `0xFF` and encryption is permanently disabled.
After the fourth time encryption is enabled, :ref:`FLASH_CRYPT_CNT` has the maximum value ``0x7F`` (7 bits set) and encryption is permanently enabled. Flashing :ref:`FLASH_CRYPT_CNT` to ``0xFF`` (8 bits set) does not re-disable encryption, the eighth bit is ignored.
Using :ref:`updating-encrypted-flash-ota` or :ref:`pregenerated-flash-encryption-key` allows you to exceed this limit.