Fixed whitespace and two typos

doc/manual/variables-and-scoping.rst

@@ -94,7 +94,7 @@ changed within their global scope and not from an outside module. ::
  # through a qualified access
  import A # makes module A available
  d = A.a
- # A.a = 2 # would error with: "ERROR: type Module has no field a"
+ # A.a = 2 # would error with: "ERROR: cannot assign variables in other modules"
  end
 
 Note that the interactive prompt (aka REPL) is in the global scope of
@@ -373,7 +373,7 @@ following example::
  2
 
 See also the closures in the examples in the next two sections.
- 
+
 .. _man-let-blocks:
 
 Let Blocks
@@ -485,7 +485,7 @@ iteration variables::
 
  x = 0
  [ x for x=1:3 ]
- X # here still equal to 0
+ x # here still equal to 0
 
 Constants
 ---------