[timers] Specify @module and @submodule for API docs

It needs to shows the correct provided module name.

Fix #1669.
[timers] Move the module description

The module description moves from prologue.js to epilogue.js. Otherwise
the module's index will be empty.
[timers] prologue.js uses @main syntax
Merge branch 'fix1669' into live-docs
[timers] Build