docs: formatting

9 jobs for improve-docs in 4 minutes and 5 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #67348
VS2015
VS2015-32-bit

00:01:15

passed #67347
VS2015
VS2015-64-bit

00:01:25

passed #67346
VS2017
VS2017-32-bit

00:01:20

passed #67345
VS2015
VS2017-64-bit

00:01:17

passed #67342
Linux
clang-c++11

00:03:46

passed #67344
Linux
cppcheck

00:00:47

passed #67349
Linux
doc

00:00:22

passed #67341
Linux
gcc-c++11

00:04:03

passed #67343
Apple
macos-c++11

00:03:01