Add documents about high density STM32L parts (chip id 0x436)

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/Datasheets/st/datasheet-256k.pdf b/Datasheets/st/datasheet-256k.pdf
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diff --git a/Datasheets/st/datasheet-384k.pdf b/Datasheets/st/datasheet-384k.pdf
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diff --git a/Datasheets/st/programming-manual-384k.pdf b/Datasheets/st/programming-manual-384k.pdf
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