Various updates for the Bugs section of the manual.
* doc/emacs/trouble.texi (Bugs): Update the section intro. (Known Problems): New section. (Checklist): Misc updates. Prefer M-x report-emacs-bug. (Sending Patches): Bug fixes are best as responses to existing bugs. * doc/emacs/emacs.texi (Known Problems): Add menu entry for new section.
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