Move properties, parameters, events, and concepts around manual sections

The pages moved as follows:
  zpool-features.{5 => 7}
  spl{-module-parameters.5 => .4}
  zfs{-module-parameters.5 => .4}
  zfs-events.5 => into zpool-events.8
  zfsconcepts.{8 => 7}
  zfsprops.{8 => 7}
  zpoolconcepts.{8 => 7}
  zpoolprops.{8 => 7}

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Co-authored-by: Daniel Ebdrup Jensen <debdrup@FreeBSD.org>
Closes #12149
Closes #12212

man/Makefile.am

@@ -11,18 +11,21 @@ dist_man_MANS = \
 	man1/arcstat.1 \
 	\
 	man5/vdev_id.conf.5 \
-	man5/zpool-features.5 \
-	man5/spl-module-parameters.5 \
-	man5/zfs-module-parameters.5 \
-	man5/zfs-events.5 \
+	\
+	man4/spl.4 \
+	man4/zfs.4 \
+	\
+	man7/zpool-features.7 \
+	man7/zfsconcepts.7 \
+	man7/zfsprops.7 \
+	man7/zpoolconcepts.7 \
+	man7/zpoolprops.7 \
 	\
 	man8/fsck.zfs.8 \
 	man8/mount.zfs.8 \
 	man8/vdev_id.8 \
 	man8/zdb.8 \
 	man8/zfs.8 \
-	man8/zfsconcepts.8 \
-	man8/zfsprops.8 \
 	man8/zfs-allow.8 \
 	man8/zfs-bookmark.8 \
 	man8/zfs-change-key.8 \
@@ -63,8 +66,6 @@ dist_man_MANS = \
 	man8/zgenhostid.8 \
 	man8/zinject.8 \
 	man8/zpool.8 \
-	man8/zpoolconcepts.8 \
-	man8/zpoolprops.8 \
 	man8/zpool-add.8 \
 	man8/zpool-attach.8 \
 	man8/zpool-checkpoint.8 \