[intro.refs,time.format] Fix normative references. #4188
Merged
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ISO/IEC/IEEE 60559:2011 and UAX#29 are not normative
requirements of C++ and thus were moved to the bibliography.
For ISO 8601:2004, highlighted its normative impact on
time formatting.
Move the footnote about the Unicode trademark to the
new first mention of the term in [intro.memory].
Fixes ISO/CS 002 (C++20 DIS)
Fixes cplusplus/nbballot#378