Update bug report template

- Remove the "SPL Version" line, the repositories have been merged
  since the 0.8 release and we no longer need to ask about this.

- Simply ask for the kernel version / patch level and add a hint
  about how to get this information on Linux and FreeBSD.

- Remove "Status: Triage Needed" from the template, in practice
  we really haven't been using this label so let's step setting it.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #12340

.github/ISSUE_TEMPLATE/bug_report.md

@@ -25,14 +25,16 @@ Type | Version/Name
  --- | ---
 Distribution Name	|
 Distribution Version	|
-Linux Kernel	|
+Kernel Version	|
 Architecture	|
-ZFS Version	|
+OpenZFS Version	|
-SPL Version	|
 <!--
-Commands to find ZFS/SPL versions:
+Command to find OpenZFS version:
-modinfo zfs | grep -iw version
+zfs version
-modinfo spl | grep -iw version
+
+Commands to find kernel version:
+uname -r		# Linux
+freebsd-version -r	# FreeBSD
 -->
 
 ### Describe the problem you're observing