Simplify Flymake user documentation
Fix some confusing parts of Flymake user documentation, like a repeated listing of situations leading to a syntax check. Documentation is now divided into three chapters only: "Using Flymake", "Extending Flymake", and a chapter for the legacy backend. Obsolete mention of "errors" and "lines" is replaced by "diagnostics/problems" and "regions" where appropriate. * doc/misc/flymake.texi (Overview of Flymake): Delete chapter. (Using Flymake): Merge with chapter "Overview of Flymake". (Installing Flymake): Delete chapter. (Flymake mode, Running the syntax check) (Navigating to error lines): Delete sections. (Syntax check statuses): Review and augment with x-references. (Backend exceptions): Mention shortcut in menu. * lisp/progmodes/flymake.el (flymake-menu): Tweak minor mode menu to not speak of "errors". (flymake-goto-next-error, flymake-goto-prev-error): Fix wording.
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