added horizontal rules to try and reinforce the notion that each section is independent of others

Troubleshooting.md

@@ -1,5 +1,7 @@
 # DRAFT
 This page contains tips for troubleshooting ZFS on Linux and what info developers might want for bug triage.
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 ## About Log Files
 Log files can be very useful for troubleshooting. In some cases, interesting information is stored in multiple log files that are correlated to system events.
 
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 The ZFS kernel modules use an internal log buffer for detailed logging information.
 This log information is available in the pseudo file `/proc/spl/kstat/zfs/dbgmsg` for ZFS builds where ZFS module parameter [zfs_dbgmsg_enable = 1](https://github.com/zfsonlinux/zfs/wiki/ZFS-on-Linux-Module-Parameters#zfs_dbgmsg_enable)
 
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 ## Unkillable Process
 Symptom: `zfs` or `zpool` command appear hung, does not return, and is not killable
 
@@ -22,6 +25,7 @@ Log files of interest: [Generic Kernel Log](#generic-kernel-log), [ZFS Kernel Mo
 Important information: if a kernel thread is stuck, then a backtrace of the stuck thread can be in the logs.
 In some cases, the stuck thread is not logged until the deadman timer expires. See also [debug tunables](https://github.com/zfsonlinux/zfs/wiki/ZFS-on-Linux-Module-Parameters#debug)
 
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 ## ZFS Events
 ZFS uses an event-based messaging interface for communication of important events to
 other consumers running on the system. The ZFS Event Daemon (zed) is a userland daemon that