Improve viewing plain text contents of document
* doc/emacs/misc.texi (Document View): Adapt to latest doc-view changes wrt viewing the document's plain text contents. * lisp/doc-view.el (doc-view-open-text): View the document's plain text in the current buffer instead of a new one. (doc-view-toggle-display): Handle the case where the current buffer contains the plain text contents of the document. (doc-view-initiate-display): Don't switch to fallback mode if the user wants to view the doc's plain text. (doc-view-set-doc-type): Use assoc-string instead of assoc-ignore-case.
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