Refer: 7.3.1 from [ISO SPEC](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf) I have added complex variants of F16 and F128 in libc doc but have omitted support for them since we will have to first investigate how their support matrix for clang and gcc looks like, and then add header guards for them accordingly. Planning to add them in follow up PRs once this gets landed.
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