<!--- 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 -->
$algo.TransformBlock($bytes, 0, $bytes.Length, $bytes, 0) > $null
    $fd.Write($bytes, 0, $bytes.Length)
} end {
    $fd.Close()
    $algo.TransformFinalBlock($bytes, 0, 0) > $null
    $hash = [System.BitConverter]::ToString($algo.Hash)
    $hash = $hash.Replace("-", "").ToLowerInvariant()
    Write-Output -InputObject "{`"sha1`":`"$hash`"}"
}''' % self._shell._escape(out_path)
        cmd_parts = self._shell._encode_script(script, as_list=True,
                                               strict_mode=False,
                                               preserve_rc=False)
        b_in_path = to_bytes(in_path, errors='surrogate_or_strict')
        if not os.path.exists(b_in_path):
            raise AnsibleFileNotFound('file or module does not exist: "%s"'
                                      % to_native(in_path))
        in_size = os.path.getsize(b_in_path)
        buffer_size = int(self.runspace.connection.max_payload_size / 4 * 3)
        
        
        
        with WinRS(self.runspace.connection, codepage=65001) as shell:
            process = Process(shell, cmd_parts[0], cmd_parts[1:])
            process.begin_invoke()
            offset = 0
            with open(b_in_path, 'rb') as src_file:
                for data in iter((lambda: src_file.read(buffer_size)), b""):
                    offset += len(data)
                    display.vvvvv("PSRP PUT %s to %s (offset=%d, size=%d" %
                                  (in_path, out_path, offset, len(data)),