Fixed some commands for scons

Changed platform to iphone but with x86 arch for simulator
Added arch parameter to 32 and 64 targets to get the correct files.

(cherry picked from commit fd276ae9024a6092383b0351c451a801f42a96b4)

reference/compiling_for_ios.rst

@@ -34,7 +34,7 @@ Alternatively, you can run
 
 ::
 
-    $ scons p=isim bin/godot.isim.tools
+    $ scons p=iphone arch=x86 bin/godot.isim.tools
 
 for a Simulator executable.
 
@@ -44,9 +44,9 @@ It can be done in three steps, first compile 32 bit version, then compile 64 bit
 
 ::
 
-    $ scons p=iphone tools=no bits=32 target=release 
-    $ scons p=iphone tools=no bits=64 target=release
-    $ lipo -create bin/godot.iphone.opt.32 arm64 bin/godot.iphone.opt.64 -output bin/godot.iphone.opt.universal
+    $ scons p=iphone tools=no bits=32 target=release arch=arm
+    $ scons p=iphone tools=no bits=64 target=release arch=arm64
+    $ lipo -create bin/godot.iphone.opt.32 bin/godot.iphone.opt.64 -output bin/godot.iphone.opt.universal
 
 
 Run