doc,tools: change bigint type to camelcase
This motivation for this change came from a pr on the quic branch where the type BigInt was used instead of the lowercase version which caused the doc target to fail.
It was a little surprising that this type was lower case and I wanted to create this commit to see if this could be changed or not (I don't know the original reason so there might be a good reason for it to be lower case).
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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