Minor updates to the documentation.

Author: Antonin Houska

NEWS

@@ -19,6 +19,11 @@ Release 1.2
     Unlike the previous release, the rewritten table can be referenced by
     foreign key constraints.
 
+    Note: The `rewrite.check_constraints` configuration variable was
+    removed. If there is a risk that other users could run `ALTER TABLE` on
+    the table during rewriting, please revoke the corresponding privileges
+    from them temporarily.
+
 
 Release 1.1.1
 =============

README.md

@@ -140,8 +140,8 @@ exist between the two types.
 
 # Constraints
 
-The target table should obviously end up with same constraints as the source
-table. It's recommended to handle constraints creation this way:
+The target table should obviously end up with the same constraints as the
+source table. It's recommended to handle constraints creation this way:
 
 1.  Add PRIMARY KEY, UNIQUE and EXCLUDE constraints of the source table to the
     target table before you call `rewrite_table()`. These are enforced during