Fewer examples use connection: local in docs (#55133)

* Fewer connection: local lines in module examples and scenario guides

The line 'connection: local' is not required. See
./docs/docsite/rst/inventory/implicit_localhost.rst

lib/ansible/modules/cloud/amazon/ec2.py

@@ -431,7 +431,6 @@ EXAMPLES = '''
 
 - name: Terminate instances
   hosts: localhost
-  connection: local
   tasks:
     - name: Terminate instances that were previously launched
       ec2:
@@ -444,7 +443,6 @@ EXAMPLES = '''
 - name: Start sandbox instances
   hosts: localhost
   gather_facts: false
-  connection: local
   vars:
     instance_ids:
       - 'i-xxxxxx'
@@ -467,7 +465,6 @@ EXAMPLES = '''
 - name: Stop sandbox instances
   hosts: localhost
   gather_facts: false
-  connection: local
   vars:
     instance_ids:
       - 'i-xxxxxx'

lib/ansible/modules/cloud/docker/docker_compose.py

@@ -165,7 +165,6 @@ EXAMPLES = '''
 
 - name: Run using a project directory
   hosts: localhost
-  connection: local
   gather_facts: no
   tasks:
     - docker_compose:
@@ -220,7 +219,6 @@ EXAMPLES = '''
 
 - name: Scale the web service to 2
   hosts: localhost
-  connection: local
   gather_facts: no
   tasks:
     - docker_compose:
@@ -234,7 +232,6 @@ EXAMPLES = '''
 
 - name: Run with inline v2 compose
   hosts: localhost
-  connection: local
   gather_facts: no
   tasks:
     - docker_compose:
@@ -269,7 +266,6 @@ EXAMPLES = '''
 
 - name: Run with inline v1 compose
   hosts: localhost
-  connection: local
   gather_facts: no
   tasks:
     - docker_compose: