fix grammatical issues

  perl (and a unix-style shell)

  diff (when a test fail, a diff is shown)

  stunnel (for HTTPS and FTPS tests)

  sshd (for SCP and SFTP tests; OpenSSH ver. 3.8 is known to work)

  ssh (for SOCKS4 and SOCK5 tests; OpenSSH ver. 4.5 is known to work.

       OpenSSH version 3.7 or greater is needed for SOCKS5)

  OpenSSH or SunSSH (for SCP, SFTP and SOCKS4/5 tests)

TCP ports used by default:

  3 to 9. Any test numbers starting with ! are disabled, as are any test

  numbers found in the file data/DISABLED (one per line).

shell startup scripts:

  Tests which use the ssh test server, SCP/SFTP/SOCKS tests, might get badly

Shell startup scripts:

  Tests which use the ssh test server, SCP/SFTP/SOCKS tests, might be badly

  influenced by the output of system wide or user specific shell startup scripts,

  .bashrc, .profile, /etc/csh.cshrc, .login, /etc/bashrc, etc. which output text

  messages or escape sequences on user login.  When this shell startup messages

  messages or escape sequences on user login.  When these shell startup messages

  or escape sequences are output they might corrupt the expected stream of data

  which flows to the sftp-server or from the ssh client which can result in bad

  test behaviour or even prevent the test server from running.