Update docs to reflect pattern syntax change

Author: catamorphism

doc/rust.texi

@@ -2702,7 +2702,7 @@ arbitrary depth.
 A @dfn{declaration statement} is one that introduces a @emph{name} into the
 enclosing statement block. The declared name may denote a new slot or a new
 item. The scope of the name extends to the entire containing block, both
-before and after the declaration.
+before and after the declaration. Tag names may not be shadowed by variable names.
 
 @menu
 * Ref.Stmt.Decl.Item::              Statement declaring an item.
@@ -3274,7 +3274,7 @@ alt x @{
     cons(10, _) @{
         process_ten();
     @}
-    nil. @{
+    nil @{
         ret;
     @}
     _ @{
@@ -3283,12 +3283,6 @@ alt x @{
 @}
 @end example
 
-Note in the above example that @code{nil} is followed by a period. This is
-required syntax for pattern matching a nullary tag variant, to distingush the
-variant @code{nil} from a binding to variable @code{nil}. Without the period
-the value of @code{x} would be bound to variable @code{nil} and the compiler
-would issue an error about the final wildcard case being unreachable.
-
 Records can also be pattern-matched and their fields bound to variables.
 When matching fields of a record, the fields being matched are specified
 first, then a placeholder (@code{_}) represents the remaining fields.

doc/tutorial/data.md

@@ -155,18 +155,16 @@ patterns, as in this definition of `area`:
         }
     }
 
-For variants without arguments, you have to write `variantname.` (with
-a dot at the end) to match them in a pattern. This to prevent
-ambiguity between matching a variant name and binding a new variable.
+Another example:
 
     # type point = {x: float, y: float};
     # enum direction { north; east; south; west; }
     fn point_from_direction(dir: direction) -> point {
         alt dir {
-            north. { {x:  0f, y:  1f} }
-            east.  { {x:  1f, y:  0f} }
-            south. { {x:  0f, y: -1f} }
-            west.  { {x: -1f, y:  0f} }
+            north { {x:  0f, y:  1f} }
+            east  { {x:  1f, y:  0f} }
+            south { {x:  0f, y: -1f} }
+            west  { {x: -1f, y:  0f} }
         }
     }