More process-related doc and manual small edits
* doc/lispref/processes.texi (Output from Processes, Filter Functions): Mention waiting-for-user-input-p. (Sentinels, Query Before Exit, System Processes, Transaction Queues): (Network Servers, Datagrams, Network Processes, Network Options) (Network Feature Testing, Serial Ports): Copyedits. (Network): Add encrypted network overview paragraph. Cross-reference the Emacs-GnuTLS manual. Use @acronym. * lisp/net/network-stream.el (open-network-stream): Doc fix. * src/process.c (Fset_process_inherit_coding_system_flag) (Fset_process_query_on_exit_flag): Doc fix (mention return value). (Fmake_network_process): Doc fix.
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