Enabled `RSpec/RepeatedDescription` cop

[yahonda]

This pull request enables RSpec/RepeatedDescription cop.

These offenses are fixed manually.

$ bundle exec rubocop
Inspecting 72 files
...............................................C...C.C..................

Offenses:

spec/active_record/connection_adapters/oracle_enhanced/dbms_output_spec.rb:50:3: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
  it "should log dbms output lines to the rails log" do
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced/dbms_output_spec.rb:60:3: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
  it "should log dbms output lines to the rails log" do
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced/schema_statements_spec.rb:884:5: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
    it "should add lob column with non_default tablespace" do
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced/schema_statements_spec.rb:892:5: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
    it "should add lob column with non_default tablespace" do
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb:81:7: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
      it "should get primary key from database at first time" do
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb:86:7: C: RSpec/RepeatedDescription: Don't repeat descriptions within an example group.
      it "should get primary key from database at first time" do
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

72 files inspected, 6 offenses detected
$

[koic]

Thanks!