<!--- Verify first that your improvement is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below, add suggestions to wording or structure -->
The [PSRP documentation](https://docs.ansible.com/ansible/latest/plugins/connection/psrp.html) mentions `ansible_psrp_connection_backoff` but this seems to be incorrect. The code appears to refer to `ansible_psrp_reconnection_backoff` instead (`reconnection` vs `connection`).
<!--- HINT: Did you know the documentation has an "Edit on GitHub" link on every page ? -->

##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
<!--- Write the short name of the rst file, module, plugin, task or feature below, use your best guess if unsure -->
PSRP
lib/ansible/plugins/connection/psrp.py

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.8.0.dev0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python2.7/dist-packages/ansible-2.8.0.dev0-py2.7.egg/ansible
  executable location = /usr/local/bin/ansible
  python version = 2.7.15rc1 (default, Nov 12 2018, 14:31:15) [GCC 7.3.0]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
None
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. OS version, browser, etc. -->
Linux, Ubuntu 18.04.2 LTS

##### ADDITIONAL INFORMATION
<!--- Describe how this improves the documentation, e.g. before/after situation or screenshots -->
None.
<!--- HINT: You can paste gist.github.com links for larger files -->
"""
        PSRP doesn't have the same concept as other protocols with its output.
        We need some extra logic to convert the pipeline streams and host
        output into the format that Ansible understands.
        :param pipeline: The finished PowerShell pipeline that invoked our
            commands
        :return: rc, stdout, stderr based on the pipeline output
        """
        
        
        
        rc = self.host.rc or (1 if pipeline.had_errors else 0)
        
        stdout_list = []
        for output in pipeline.output:
            
            
            
            if isinstance(output, GenericComplexObject) and output.to_string is None:
                obj_lines = output.property_sets
                for key, value in output.adapted_properties.items():
                    obj_lines.append(u"%s: %s" % (key, value))
                for key, value in output.extended_properties.items():
                    obj_lines.append(u"%s: %s" % (key, value))
                output_msg = u"\n".join(obj_lines)
            else:
                output_msg = to_text(output, nonstring='simplerepr')
            stdout_list.append(output_msg)
        if len(self.host.ui.stdout) > 0: