Various improvements, mainly regarding ERRORS.

* Document EINVAL and EEXIST.
* Neither mkstemp nor mkdtemp use lstat, but mktemp does.
* Documenting ENOTDIR is useless, it is documented in lstat(2), mkdir(2)
  and open(2), and it's just one thing out of several that could go wrong.
* Refer to lstat(2) instead of stat(2), which is actually used here.
* State that two of these functions are standardized in the XPG.
* Move the sentence about mkdtemp and mkstemps to the new STANDARDS section.
* Get rid of the ugly ".So Li X Sc Ns s", just use "Xs" (suggested by jmc@).

tweaks and ok  jmc@ millert@

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