big number documentation fixes #461

Job	Run time
• gcc • ubuntu:22.04	41s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • gcc • ubuntu:22.04	23s
-DQCBOR_DISABLE_TAGS • gcc • ubuntu:22.04	28s
-DUSEFULBUF_DISABLE_ALL_FLOAT • gcc • ubuntu:22.04	30s
-DQCBOR_DISABLE_FLOAT_HW_USE • gcc • ubuntu:22.04	29s
-DQCBOR_DISABLE_PREFERRED_FLOAT • gcc • ubuntu:22.04	30s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • gcc • ubuntu:22.04	26s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • gcc • ubuntu:22.04	40s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • gcc • ubuntu:22.04	29s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • gcc • ubuntu:22.04	25s
-DQCBOR_DISABLE_UNCOMMON_TAGS • gcc • ubuntu:22.04	55s
• clang • ubuntu:22.04	28s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • clang • ubuntu:22.04	1m 9s
-DQCBOR_DISABLE_TAGS • clang • ubuntu:22.04	34s
-DUSEFULBUF_DISABLE_ALL_FLOAT • clang • ubuntu:22.04	1m 8s
-DQCBOR_DISABLE_FLOAT_HW_USE • clang • ubuntu:22.04	48s
-DQCBOR_DISABLE_PREFERRED_FLOAT • clang • ubuntu:22.04	37s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • clang • ubuntu:22.04	48s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • clang • ubuntu:22.04	33s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • clang • ubuntu:22.04	46s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • clang • ubuntu:22.04	54s
-DQCBOR_DISABLE_UNCOMMON_TAGS • clang • ubuntu:22.04	43s
	14m 24s

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