N3908 is so yesterday.
Add missing link to C++14[syserr] before is_error_code_enum_v.
Make namespace formatting more consistent and document the guidelines.
Fix a misspelling in general.defns.
Move treat_as_floating_point_v into std::chrono::experimental::fundamentals_v1
to match N3932, which specified it in std::chrono.

Add some text to [general.namespaces] to explain why not
std::experimental::fundamentals_v1::chrono.
Update the standalone document.