Remove some scenarios that are tested through unit tests

See
https://github.com/cucumber/cucumber-ruby-core/blob/master/spec/cucumber/core/test/case_spec.rb#L235

features/docs/cli/run_specific_scenarios.feature

@@ -3,90 +3,35 @@ Feature: Run specific scenarios
   You can choose to run a specific scenario using the file:line format,
   or you can pass in a file with a list of scenarios using @-notation.
 
+  The line number can fall anywhere within the body of a scenario, including
+  steps, tags, comments, description, data tables or doc strings.
+
+  For scenario outlines, if the line hits one example row, just that one
+  will be run. Otherwise all examples in the table or outline will be run.
+
   Background:
     Given the standard step definitions
 
   Scenario: Two scenarios, run just one of them
     Given a file named "features/test.feature" with:
       """
       Feature: 
-        Scenario:
+
+        Scenario: Miss
           Given this step is undefined
 
         Scenario: Hit
           Given this step passes
       """
-    When I run `cucumber features/test.feature:5 -f progress`
+    When I run `cucumber features/test.feature:7 --format pretty --quiet`
     Then it should pass with:
       """
-      1 scenario (1 passed)
-      """
-
-  Scenario: Single example from a scenario outline
-    Given a file named "features/test.feature" with:
-      """
-      Feature:
-        Scenario Outline:
-          Given this step <something>
-
-          Examples:
-            | something    |
-            | is undefined |
-            | fails        |
-
-        Scenario: Miss
-          Given this step passes
-      """
-    When I run `cucumber features/test.feature:8 -f progress`
-    Then it should fail with:
-      """
-      1 scenario (1 failed)
-      """
-
-  @spawn
-  Scenario: Specify 2 line numbers where one is a tag
-    Given a file named "features/test.feature" with:
-      """
-      Feature: Sample
-
-        @two @three
-        Scenario:
-          Given this step passes
+      Feature: 
 
-        @four
-        Scenario:
+        Scenario: Hit
           Given this step passes
-      """
-    When I run `cucumber -q features/test.feature:3:8`
-    Then it should pass with:
-      """
-      2 scenarios (2 passed)
-      2 steps (2 passed)
-      """
-
-  Scenario: Specify the line number of a row
-    Given a file named "features/test.feature" with:
-      """
-      Feature: Sample
-        Scenario: Passing
-          Given this step is a table step
-            | a | b |
-            | c | d |
-
-      """
-    When I run `cucumber -q features/test.feature:4`
-    Then it should pass with:
-      """
-      Feature: Sample
-
-        Scenario: Passing
-          Given this step is a table step
-            | a | b |
-            | c | d |
 
       1 scenario (1 passed)
-      1 step (1 passed)
-
       """
 
   Scenario: Use @-notation to specify a file containing feature file list