[libc++][doc] Updates the libc++ status page. (#100595)

- LWG3147 Definitions of "likely" and "unlikely" are likely to cause
problems Adjusts the requirements on programs using the Standard
library.

- LWG3328 Clarify that std::string is not good for UTF-8 Adds a
non-normative note, aimed at users of the Standard library.

- LWG3784 std.compat should not provide ::byte and its friends was
implemented during modules.

- LWG3062 Unnecessary decay_t in is_execution_policy_v should be
remove_cvref_t Was implemented while implementing parallel algorithms.

- LWG3362 Strike stop_source's operator!= The removed operator was never
implemented.

- LWG3616 LWG 3498 seems to miss the non-member swap for basic_syncbuf
This was implemented correctly from the start.

- LWG3199 istream >> bitset<0> fails This was implemented in
fc4486c2472b84384d4a31d2436a91bdb9b29792, might be in LLVM-9

- LWG3828 Sync intmax_t and uintmax_t with C2x Standardardized existing
practice.

- LWG3713 Sorted with respect to comparator (only) Wording issue in the
Standard.

- LWG3823 Unnecessary precondition for is_aggregate Changes the
preconditions

- LWG3826 Redundant specification [for overload of yield_value] Changes
a remark to a note

- LWG3203 span element access invalidation Update wording relevant for
users of the Standard library.

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