Improve the MS-Windows appendix of the Emacs manual
* doc/emacs/msdos.texi (Windows Startup): Describe the pinned shortcuts for starting Emacs. (Text and Binary): Minor wording changes. (Windows Files): Mention 'read-file-name-completion-ignore-case'. (ls in Lisp): Update the list of supported 'ls' switches. Document 'ls-lisp-use-string-collate' and 'ls-lisp-UCA-like-collation'. (Windows HOME): Mention warnings displayed at startup when deprecated locations of HOME and/or deprecated names for init files are used. (Windows Keyboard): Mention delete-selection-mode.
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