Fix "or_greater"/"or_less" code example

The code example demonstrating the usage of the "or_greater" and "or_less" hints for the export_range annotation does not declare a variable after the annotation, which is inconsistent with the previous three code examples in the section.
Also, giving the export_range a step of 1 does not create a slider for the property in the editor, like the text suggests, but it instead creates a spin box. The step should be changed to a float so the property can appear as a slider.

tutorials/scripting/gdscript/gdscript_exports.rst

@@ -164,7 +164,7 @@ The limits can be only for the slider if you add the hints "or_greater" and/or "
 
 ::
 
-    @export_range(0, 100, 1, "or_greater", "or_less")
+    @export_range(0, 100, 0.1, "or_greater", "or_less") var l
 
 .. TODO: Document other hint strings usable with export_range.