* GH-8559: Document how to enable SOCKS for SFTP Fixes https://github.com/spring-projects/spring-integration/issues/8559 An out-of-the-box `SshClient` does not provide a smooth HTTP/SOCKS proxy configuration. * Mention in the `sftp.adoc` that `JGitSshClient`, configured with SOCKS, can be injected into a `DefaultSftpSessionFactory` * Fix Javadocs for `DefaultSftpSessionFactory`, respectively * Fix language in doc Co-authored-by: Gary Russell <grussell@vmware.com> --------- Co-authored-by: Gary Russell <grussell@vmware.com>