Fix documentation typo introduced in [8250]. Closes #10339 [Henrik N]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8256 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

+* Fix documentation typo introduced in [8250]. Closes #10339 [Henrik N]
+
 *2.0.0 [RC2]* (November 28th, 2007)
 
 * Foxy fixtures: support single-table inheritance.  #10234 [tom]

activerecord/lib/active_record/validations.rb

@@ -596,7 +596,7 @@ def validates_length_of(*attrs)
       # attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself.
       #
       # Because this check is performed outside the database there is still a chance that duplicate values
-      # will be inserted in two parrallel transactions.  To guarantee against this you should create a 
+      # will be inserted in two parallel transactions.  To guarantee against this you should create a 
       # unique index on the field. See +create_index+ for more information.
       #
       # Configuration options: