Fix a couple of examples (there is no "fetch_by_Slice()" method).

modules/Bio/EnsEMBL/DBSQL/AssemblyExceptionFeatureAdaptor.pm

@@ -6,10 +6,10 @@ Bio::EnsEMBL::DBSQL::AssemblyExceptionFeatureAdaptor
 
 =head1 SYNOPSIS
 
-my $assembly_exception_feature_adaptor =
+  my $assembly_exception_feature_adaptor =
     $database_adaptor->get_AssemblyExceptionFeatureAdaptor();
-@assembly_exception_features =
-    $assembly_exception_feature_adaptor->fetch_by_Slice($slice);
+  @assembly_exception_features =
+    $assembly_exception_feature_adaptor->fetch_all_by_Slice($slice);
 
 =head1 DESCRIPTION
 

modules/Bio/EnsEMBL/DBSQL/DnaAlignFeatureAdaptor.pm

@@ -13,7 +13,7 @@ Bio::EnsEMBL::DBSQL::DnaAlignFeatureAdaptor - Adaptor for DnaAlignFeatures
 
   $dafa = $registry->get_adaptor( 'Human', 'Core', 'DnaAlignFeature' );
 
-  my @features = @{ $dafa->fetch_by_Slice($slice) };
+  my @features = @{ $dafa->fetch_all_by_Slice($slice) };
 
   $dafa->store(@features);