It is because the STM32 runs thumb code so the least significant bit of a code address must be 1. Trying to jump to an even address would raise an exception because the Cortex-M3 cannot run ARM code.
The low bit of the PC must be set to 1 to indicate the function is in Thumb, the STM32 (Cortex-M3) doesn't support ARM which would have the bit set to 0.
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