lisp/*.el: More lexical-binding warnings' cleanups.

lisp/*.el: More lexical-binding warnings' cleanups.

* tutorial.el (tutorial--describe-nonstandard-key): Use string-match-p.
  (tutorial--detailed-help): Remove unused local variables.
  (tutorial--save-tutorial-to): Use ignore-errors.
  (help-with-tutorial): Use looking-at-p.

* view.el (view-buffer-other-window, view-buffer-other-frame):
  Mark unused arguments.

* woman.el (woman-parse-colon-path, woman-parse-colon-path)
  (woman-select-symbol-fonts, woman, woman-find-file)
  (woman-insert-file-contents, woman-non-underline-faces):
  Use string-match-p.
  (woman1-unquote): Move declaration.

* xml.el (xml-parse-tag-1, xml-parse-string): Use looking-at-p.
  (xml-parse-dtd): Use looking-at-p, string-match-p.  Mark unused
  argument.  Remove unused local variable.
  (xml-parse-elem-type): Use string-match-p.
  (xml-substitute-numeric-entities): Use ignore-errors.