Merge "init: fix loglevel docs."

  This is included in the default init.rc.

`loglevel <level>`

> Sets the kernel log level to level. Properties are expanded within _level_.

> Sets init's log level to the integer level, from 7 (all logging) to 0

  (fatal logging only). The numeric values correspond to the kernel log

  levels, but this command does not affect the kernel log level. Use the

  `write` command to write to `/proc/sys/kernel/printk` to change that.

  Properties are expanded within _level_.

`mkdir <path> [mode] [owner] [group]`

> Create a directory at _path_, optionally with the given mode, owner, and