##### SUMMARY
<!--- Explain the problem briefly below, add suggestions to wording or structure -->
The [main configuration documentation](https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-pipelining) says that pipelining is enabled in the `ssh_connection` or `connection` section.

The [ssh connection plugin](https://docs.ansible.com/ansible/latest/plugins/connection/ssh.html#parameter-pipelining) configuration says pipelining should  be enabled in the `defaults` section.

#31125 (and the associated commit) seems to imply that the `ssh_connection` section is legacy, but the comments (https://github.com/ansible/ansible/issues/31125#issuecomment-334071699) seem to say otherwise.

The actual sections (as demonstrated in the configuration section below) that works are `ssh_connection` and `connection`.


##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
ssh

##### ANSIBLE VERSION

```paste below
ansible 2.9.9
  config file = /c/xxx/ansible/ansible.cfg
  configured module search path = ['/c/Users/bendem/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /c/Users/bendem/.local/share/virtualenvs/ansible-oaopcvR0/lib/python3.8/site-packages/ansible
  executable location = /c/Users/bendem/.local/share/virtualenvs/ansible-oaopcvR0/bin/ansible
  python version = 3.8.3 (default, May 18 2020, 08:39:23) [GCC 9.3.0]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
With `[defaults]\npipelining = true`

```
ALLOW_WORLD_READABLE_TMPFILES(/c/xxx/ansible/ansible.cfg) = False
ANSIBLE_SSH_EXECUTABLE(/c/xxx/ansible/ansible.cfg) = /usr/bin/ssh
ANSIBLE_SSH_RETRIES(/c/xxx/ansible/ansible.cfg) = 1
DEFAULT_HOST_LIST(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/inventory/inventory.ini']
DEFAULT_ROLES_PATH(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/vendors/roles', '/c/xxx/ansible/roles']
DEFAULT_VAULT_ID_MATCH(/c/xxx/ansible/ansible.cfg) = true
DIFF_ALWAYS(/c/xxx/ansible/ansible.cfg) = True
INTERPRETER_PYTHON(/c/xxx/ansible/ansible.cfg) = /usr/bin/python3
INVENTORY_UNPARSED_IS_FAILED(/c/xxx/ansible/ansible.cfg) = True
```

With `[ssh_connection]\npipelining = true`

```paste below
ALLOW_WORLD_READABLE_TMPFILES(/c/xxx/ansible/ansible.cfg) = False
ANSIBLE_PIPELINING(/c/xxx/ansible/ansible.cfg) = True
ANSIBLE_SSH_EXECUTABLE(/c/xxx/ansible/ansible.cfg) = /usr/bin/ssh
ANSIBLE_SSH_RETRIES(/c/xxx/ansible/ansible.cfg) = 1
DEFAULT_HOST_LIST(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/inventory/inventory.ini']
DEFAULT_ROLES_PATH(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/vendors/roles', '/c/xxx/ansible/roles']
DEFAULT_VAULT_ID_MATCH(/c/xxx/ansible/ansible.cfg) = true
DIFF_ALWAYS(/c/xxx/ansible/ansible.cfg) = True
INTERPRETER_PYTHON(/c/xxx/ansible/ansible.cfg) = /usr/bin/python3
INVENTORY_UNPARSED_IS_FAILED(/c/xxx/ansible/ansible.cfg) = True
```

With `[connection]\npipelining = true`

```paste below
ALLOW_WORLD_READABLE_TMPFILES(/c/xxx/ansible/ansible.cfg) = False
ANSIBLE_PIPELINING(/c/xxx/ansible/ansible.cfg) = True
ANSIBLE_SSH_EXECUTABLE(/c/xxx/ansible/ansible.cfg) = /usr/bin/ssh
ANSIBLE_SSH_RETRIES(/c/xxx/ansible/ansible.cfg) = 1
DEFAULT_HOST_LIST(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/inventory/inventory.ini']
DEFAULT_ROLES_PATH(/c/xxx/ansible/ansible.cfg) = ['/c/xxx/ansible/vendors/roles', '/c/xxx/ansible/roles']
DEFAULT_VAULT_ID_MATCH(/c/xxx/ansible/ansible.cfg) = true
DIFF_ALWAYS(/c/xxx/ansible/ansible.cfg) = True
INTERPRETER_PYTHON(/c/xxx/ansible/ansible.cfg) = /usr/bin/python3
INVENTORY_UNPARSED_IS_FAILED(/c/xxx/ansible/ansible.cfg) = True
```

##### OS / ENVIRONMENT
Windows 10, msys2 python3, not that it matters.

##### ADDITIONAL INFORMATION
<!--- Describe how this improves the documentation, e.g. before/after situation or screenshots -->

<!--- HINT: You can paste gist.github.com links for larger files -->

'''Remove a temporary path we created. '''
        if tmp_path is None and self._connection._shell.tmpdir:
            tmp_path = self._connection._shell.tmpdir
        if self._should_remove_tmp_path(tmp_path):
            cmd = self._connection._shell.remove(tmp_path, recurse=True)
            
            
            tmp_rm_res = self._low_level_execute_command(cmd, sudoable=False)
            if tmp_rm_res.get('rc', 0) != 0:
                display.warning('Error deleting remote temporary files (rc: %s, stderr: %s})'
                                % (tmp_rm_res.get('rc'), tmp_rm_res.get('stderr', 'No error string available.')))
            else:
                self._connection._shell.tmpdir = None
    def _transfer_file(self, local_path, remote_path):
        """
        Copy a file from the controller to a remote path
        :arg local_path: Path on controller to transfer
        :arg remote_path: Path on the remote system to transfer into
        .. warning::
            * When you use this function you likely want to use use fixup_perms2() on the
              remote_path to make sure that the remote file is readable when the user becomes
              a non-privileged user.
            * If you use fixup_perms2() on the file and copy or move the file into place, you will
              need to then remove filesystem acls on the file once it has been copied into place by
              the module.  See how the copy module implements this for help.
        """
        self._connection.put_file(local_path, remote_path)
        return remote_path
    def _transfer_data(self, remote_path, data):