Use a table in set_physics_override()

doc/lua_api.txt

@@ -1706,11 +1706,13 @@ Player-only: (no-op for other objects)
     {jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}
 - get_player_control_bits(): returns integer with bit packed player pressed keys
     bit nr/meaning: 0/up ,1/down ,2/left ,3/right ,4/jump ,5/aux1 ,6/sneak ,7/LMB ,8/RMB
-- set_physics_override(speed, jump, gravity, sneak, sneak_glitch)
-    modifies per-player walking speed, jump height, and gravity.
-    Values default to 1 and act as offsets to the physics settings 
-    in minetest.conf. nil will keep the current setting.
-    sneak and sneak_glitch are booleans, default is true
+- set_physics_override({
+    speed = 1.0, -- multiplier to default value
+    jump = 1.0, -- multiplier to default value
+    gravity = 1.0, -- multiplier to default value
+    sneak = true, -- whether player can sneak
+    sneak_glitch = true, -- whether player can use the sneak glitch
+  })
 - hud_add(hud definition): add a HUD element described by HUD def, returns ID number on success
 - hud_remove(id): remove the HUD element of the specified id
 - hud_change(id, stat, value): change a value of a previously added HUD element