Remove bar position left:right from docs

And adds a warning about using them (currently these are not supported
by swaybar).

sway/commands.c

@@ -2849,8 +2849,10 @@ static struct cmd_results *bar_cmd_position(int argc, char **argv) {
 	} else if (strcasecmp("bottom", argv[0]) == 0) {
 		config->current_bar->position = DESKTOP_SHELL_PANEL_POSITION_BOTTOM;
 	} else if (strcasecmp("left", argv[0]) == 0) {
+		sway_log(L_INFO, "Warning: swaybar currently only supports top and bottom positioning. YMMV");
 		config->current_bar->position = DESKTOP_SHELL_PANEL_POSITION_LEFT;
 	} else if (strcasecmp("right", argv[0]) == 0) {
+		sway_log(L_INFO, "Warning: swaybar currently only supports top and bottom positioning. YMMV");
 		config->current_bar->position = DESKTOP_SHELL_PANEL_POSITION_RIGHT;
 	} else {
 		error = cmd_results_new(CMD_INVALID, "position", "Invalid value %s", argv[0]);

sway/sway-bar.5.txt

@@ -27,7 +27,7 @@ Commands
 **id** <bar_id>::
 	Sets the ID of the bar.
 
-**position** <top|bottom|left|right>::
+**position** <top|bottom>::
 	Sets position of the bar. Default is _bottom_.
 
 **output** <output>::