Remove an example which is a syntax error in Ruby's parser

This code generates a syntax error as follows:
```ruby
❯ ruby -e '[1].each { put _1; [1].each { put _1 } }'
-e: -e:1: syntax error found (SyntaxError)
> 1 | ... _1 } }
    |     ^~ numbered parameter is already used in outer block
```

When numbered parameters are used in nested blocks, it is not possible to use numbered parameters in multiple different hierarchies.

While it was considered to split these up, we discussed below.
#2014 (comment)

Author: ydah

spec/rubocop/cop/rspec/pending_without_reason_spec.rb

@@ -300,35 +300,6 @@
         end
       RUBY
     end
-
-    context 'with a numblock' do
-      it 'registers offense' do
-        expect_offense(<<~RUBY)
-          RSpec.describe Foo do
-            pending
-            ^^^^^^^ Give the reason for pending.
-            skip
-            ^^^^ Give the reason for skip.
-            _1
-            context 'when something' do
-              _1
-              pending
-              ^^^^^^^ Give the reason for pending.
-              skip
-              ^^^^ Give the reason for skip.
-              it 'does something' do
-                _1
-                skip
-                ^^^^ Give the reason for skip.
-                pending
-                ^^^^^^^ Give the reason for pending.
-                _1
-              end
-            end
-          end
-        RUBY
-      end
-    end
   end
 
   context 'when pending/skip inside conditional' do