Update docs

docs/lua_api.txt

@@ -734,6 +734,12 @@ DebugLine
 	**add_line** (debug_line, start, end, color)
 		Adds a line from *start* to *end* with the given *color*.
 
+	**add_axes** (debug_line, tm, length)
+		Adds lines for each axis with the given *length*.
+
+	**add_cone** (debug_line, from, to, radius, color)
+		Adds a cone with the base centered at *from* and the tip at *to*.
+
 	**add_sphere** (debug_line, center, radius, color)
 		Adds a sphere at *center* with the given *radius* and *color*.