Fix some minor typos.

lib/sequel/plugins/identity_map.rb

@@ -36,7 +36,7 @@ module IdentityMap
       module ClassMethods
         # Override the default :eager_loader option for many_*_many associations to work
         # with an identity_map.  If the :eager_graph association option is used, you'll probably have to use
-        # :uniq=>true on the current association amd :cartesian_product_number=>2 on the association
+        # :uniq=>true on the current association and :cartesian_product_number=>2 on the association
         # mentioned by :eager_graph, otherwise you'll end up with duplicates because the row proc will be
         # getting called multiple times for the same object.  If you do have duplicates and you use :eager_graph,
         # they'll probably be lost.  Making that work correctly would require changing a lot of the core

lib/sequel/plugins/tactical_eager_loading.rb

@@ -60,7 +60,7 @@ def load_associated_objects(opts, reload=false)
       module DatasetMethods
         private
 
-        # Set the reteived_with and retrieved_by attributes for the object
+        # Set the retrieved_with and retrieved_by attributes for the object
         # with the current dataset and array of all objects.
         def post_load(objects)
           super

spec/extensions/tactical_eager_loading_spec.rb

@@ -25,7 +25,7 @@ class ::TaticalEagerLoadingModel < Sequel::Model
     Object.send(:remove_const, :TaticalEagerLoadingModel)
   end
 
-  it "Dataset#all should set the retrieved_by and reteived_with attributes" do
+  it "Dataset#all should set the retrieved_by and retrieved_with attributes" do
     ts = @c.all
     ts.map{|x| [x.retrieved_by, x.retrieved_with]}.should == [[@ds,ts], [@ds,ts], [@ds,ts], [@ds,ts]]
   end