use spaces in lua_api

doc/lua_api.txt

@@ -1074,61 +1074,61 @@ methods:
 - spawn_tree (pos, {treedef})
   ^ spawns L-System tree at given pos with definition in treedef table
 treedef={
-	axiom,			- string	initial tree axiom
-	rules_a,		- string	rules set A
-	rules_b,		- string	rules set B
-	rules_c,		- string	rules set C
-	rules_d,		- string	rules set D
-	trunk,			- string	trunk node name
-	leaves,			- string	leaves node name
-	leaves2,		- string	secondary leaves node name
-	leaves2_chance,	- num		chance (0-100) to replace leaves with leaves2
-	angle,			- num		angle in deg
-	iterations,		- num		max # of iterations, usually 2 -5
-	random_level,	- num		factor to lower nr of iterations, usually 0 - 3
-	trunk_type,		- string	(single/double/crossed) type of trunk: 1 node, 2x2 nodes or 3x3 in cross shape
-	thin_branches,	- boolean	true -> use thin (1 node) branches
-	fruit,			- string	fruit node name
-	fruit_chance,	- num		chance (0-100) to replace leaves with fruit node
+  axiom,         - string  initial tree axiom
+  rules_a,       - string  rules set A
+  rules_b,       - string  rules set B
+  rules_c,       - string  rules set C
+  rules_d,       - string  rules set D
+  trunk,         - string  trunk node name
+  leaves,        - string  leaves node name
+  leaves2,       - string  secondary leaves node name
+  leaves2_chance,- num     chance (0-100) to replace leaves with leaves2
+  angle,         - num     angle in deg
+  iterations,    - num     max # of iterations, usually 2 -5
+  random_level,  - num     factor to lower nr of iterations, usually 0 - 3
+  trunk_type,    - string  single/double/crossed) type of trunk: 1 node, 2x2 nodes or 3x3 in cross shape
+  thin_branches, - boolean true -> use thin (1 node) branches
+  fruit,         - string  fruit node name
+  fruit_chance,	 - num     chance (0-100) to replace leaves with fruit node
   }
 
 Key for Special L-System Symbols used in Axioms
-	G  - move forward one unit with the pin down
-	F  - move forward one unit with the pin up drawing trunks and branches
-	f  - move forward one unit with the pin up drawing leaves
-	A  - replace with rules set A
-	B  - replace with rules set B
-	C  - replace with rules set C
-	D  - replace with rules set D
-	a  - replace with rules set A, chance 90%
-	b  - replace with rules set B, chance 80%
-	c  - replace with rules set C, chance 70%
-	d  - replace with rules set D, chance 60%
-	+  - yaw the turtle right by angle parameter
-	-  - yaw the turtle left by angle parameter
-	&  - pitch the turtle down by angle parameter
-	^  - pitch the turtle up by angle parameter
-	/  - roll the turtle to the right by angle parameter
-	*  - roll the turtle to the left by angle parameter
-	[  - save in stack current state info
-	]  - recover from stack state info
+  G  - move forward one unit with the pin down
+  F  - move forward one unit with the pin up drawing trunks and branches
+  f  - move forward one unit with the pin up drawing leaves
+  A  - replace with rules set A
+  B  - replace with rules set B
+  C  - replace with rules set C
+  D  - replace with rules set D
+  a  - replace with rules set A, chance 90%
+  b  - replace with rules set B, chance 80%
+  c  - replace with rules set C, chance 70%
+  d  - replace with rules set D, chance 60%
+  +  - yaw the turtle right by angle parameter
+  -  - yaw the turtle left by angle parameter
+  &  - pitch the turtle down by angle parameter
+  ^  - pitch the turtle up by angle parameter
+  /  - roll the turtle to the right by angle parameter
+  *  - roll the turtle to the left by angle parameter
+  [  - save in stack current state info
+  ]  - recover from stack state info
 
 Example usage: spawn small apple tree
-	apple_tree={
-		axiom="FFFFFAFFBF",
-		rules_a="[&&&FFFFF&&FFFF][&&&++++FFFFF&&FFFF][&&&----FFFFF&&FFFF]",
-		rules_b="[&&&++FFFFF&&FFFF][&&&--FFFFF&&FFFF][&&&------FFFFF&&FFFF]",
-		trunk="default:tree",
-		leaves="default:leaves",
-		angle=30,
-		iterations=2,
-		random_level=0,
-		trunk_type="single",
-		thin_branches=true,
-		fruit_chance=10,
-		fruit="default:apple"
-	}
-	minetest.env:spawn_tree(pos,apple_tree)
+apple_tree={
+  axiom="FFFFFAFFBF",
+  rules_a="[&&&FFFFF&&FFFF][&&&++++FFFFF&&FFFF][&&&----FFFFF&&FFFF]",
+  rules_b="[&&&++FFFFF&&FFFF][&&&--FFFFF&&FFFF][&&&------FFFFF&&FFFF]",
+  trunk="default:tree",
+  leaves="default:leaves",
+  angle=30,
+  iterations=2,
+  random_level=0,
+  trunk_type="single",
+  thin_branches=true,
+  fruit_chance=10,
+  fruit="default:apple"
+  }
+minetest.env:spawn_tree(pos,apple_tree)
 
 Deprecated:
 - add_rat(pos): Add C++ rat object (no-op)