Add documentation to loop contracts, __CPROVER_loop_entry #10283

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check-ubuntu-20_04-make-clang	24m 45s
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check-ubuntu-20_04-make-gcc	19m 2s
check-ubuntu-22_04-cmake-gcc	16m 44s
check-ubuntu-22_04-cmake-gcc-32bit	15m 15s
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	7h 6m 12s

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