[various] Add "Clause" to clause refs.
[temp.names] Fix paragraph 9 example.
[temp.class, temp.mem] More variety in examples.
[temp.friend] Fix example typos.
[temp.class.spec] Fix example.
[temp.friend] Overhaul.
[temp.friend] Fix paragraph number in last change.
[temp.inst] Remove stray comma.
[temp.explicit] Correct example.
[temp.explicit, temp.expl.spec] Fix examples.
[temp.deduct.decl] Remove commas.
[temp.deduct] Suggested wording improvements.
[temp.deduct] Invalid expression means substitution failure.
[expr.prim.general] Add missing </cxx-section>.
[temp.constr.atom.type] Fix "does not satisfies".
[temp.constr.atom.deduct] Add semicolons and use abbreviated syntax.
[temp.constr.order] Drop "if not that".
[temp.constr.order] Fix example.
[temp.constr.expr] Add commas.
[temp.constr.expr] Fix typos.