added more documentation to from_chars and to_chars

6 jobs for master in 4 minutes and 29 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #7887
debian:10 clang-7-libcpp-17

00:02:08

passed #7886
debian:10 gcc-8-noassert-17

00:02:35

passed #7889
debian:9 clang-3.8-14

00:02:02

passed #7888
debian:9 gcc-6-14

00:01:39

passed #7890
ubuntu:16.04 gcc-5-14

00:01:24

passed #7891
ubuntu:18.04 clang-6-17

00:02:18