Suppress offenses of InternalAffairs/ExampleDescription

This commit suppresses the following offenses of `InternalAffairs/ExampleDescription`:

```console
$ bundle exec rubocop
(snip)

spec/rubocop/cop/rails/bulk_change_table_spec.rb:348:8: C: [Correctable] InternalAffairs/ExampleDescription: Description does not match use of expect_offense.
    it 'register an offense when using string as table name' do
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/rubocop/cop/rails/bulk_change_table_spec.rb:358:8: C: [Correctable] InternalAffairs/ExampleDescription: Description does not match use of expect_offense.
    it 'register an offense when using mixed style table name' do
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/rubocop/cop/rails/lexically_scoped_action_filter_spec.rb:61:6: C: [Correctable] InternalAffairs/ExampleDescription: Description does not match use of expect_offense.
  it 'register an offense when using action filter in module' do
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/rubocop/cop/rails/read_write_attribute_spec.rb:16:8: C: [Correctable] InternalAffairs/ExampleDescription: Description does not match use of expect_offense.
    it 'register an offense and corrects a string' do
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

292 files inspected, 4 offenses detected, 4 offenses autocorrectable
```

spec/rubocop/cop/rails/bulk_change_table_spec.rb

@@ -345,7 +345,7 @@ def change; end
       RUBY
     end
 
-    it 'register an offense when using string as table name' do
+    it 'registers an offense when using string as table name' do
       expect_offense(<<~RUBY)
         def change
           remove_index "users", :name
@@ -355,7 +355,7 @@ def change
       RUBY
     end
 
-    it 'register an offense when using mixed style table name' do
+    it 'registers an offense when using mixed style table name' do
       expect_offense(<<~RUBY)
         def change
           remove_index "users", :name

spec/rubocop/cop/rails/lexically_scoped_action_filter_spec.rb

@@ -58,7 +58,7 @@ class LoginController < ApplicationController
     RUBY
   end
 
-  it 'register an offense when using action filter in module' do
+  it 'registers an offense when using action filter in module' do
     expect_offense <<~RUBY
       module FooMixin
         extend ActiveSupport::Concern

spec/rubocop/cop/rails/read_write_attribute_spec.rb

@@ -13,7 +13,7 @@
       RUBY
     end
 
-    it 'register an offense and corrects a string' do
+    it 'registers an offense and corrects a string' do
       expect_offense(<<~RUBY)
         res = read_attribute('test')
               ^^^^^^^^^^^^^^^^^^^^^^ Prefer `self['test']`.