Improve documentation of 'file-local-name' and related APIs
* doc/lispref/files.texi (Unique File Names) (Magic File Names, File Name Expansion): Improve documentation of the "local part" of a remote file name. * doc/lispref/processes.texi (Synchronous Processes) (Asynchronous Processes): State explicitly that program and file names passed to functions that start remote processes need to be relative or obtained by 'file-local-name'. * lisp/files.el (file-local-name): * lisp/simple.el (start-file-process, process-file): Improve the documentation of the "local part" of a remote file name, and its use in APIs that start remote processes.
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