btrfs-progs: dump-tree: update help and docs regarding DFS/BFS

The default traversal has been switched to BFS due, update the
documentation accordingly. Also fix the help text of the command that
ommitted to mention the options.

Signed-off-by: David Sterba <dsterba@suse.com>

Documentation/btrfs-inspect-internal.asciidoc

@@ -90,10 +90,14 @@ print info of the specified block only, can be specified multiple times
 --follow::::
 use with '-b', print all children tree blocks of '<block_num>'
 --dfs::::
-use depth-first search to print trees. (default) the nodes and leaves are
+(default up to 5.2)
++
+use depth-first search to print trees, the nodes and leaves are
 intermixed in the output
 --bfs::::
-use breadth-first search to print trees. the nodes are printed before all
+(default since 5.3)
++
+use breadth-first search to print trees, the nodes are printed before all
 leaves
 --noscan::::
 do not automatically scan the system for other devices from the same

cmds/inspect-dump-tree.c

@@ -204,6 +204,8 @@ static const char * const cmd_inspect_dump_tree_usage[] = {
 	"-t|--tree <tree_id>    print only tree with the given id (string or number)",
 	"--follow               use with -b, to show all children tree blocks of <block_num>",
 	"--noscan               do not scan the devices from the filesystem, use only the listed ones",
+	"--bfs                  breadth-first traversal of the trees, print nodes, then leaves (default)",
+	"--dfs                  depth-first traversal of the trees",
 	NULL
 };