; Improve the use-package manual

; Improve the use-package manual

* doc/misc/use-package.texi (Top, Basic Concepts)
(Getting Started, Loading Packages, Loading basics)
(Deferring loading, Forcing loading, Conditional loading)
(Loading sequentially, Load dependencies, Load path)
(Manual autoloads, Configuring Packages, Lisp Configuration)
(Preface keyword, Init keyword, Best practices, Key bindings)
(Global keybindings, Binding in keymaps, Binding to a keymap)
(Binding to repeat-maps, Displaying keybindings)
(Modes and interpreters, Magic handlers, User options, Faces)
(Delight, Diminish, Install package, Pinning packages)
(Other package managers, Byte-compiling, Troubleshooting)
(Troubleshooting Options, Gathering Statistics)
(Disabling a package, Keyword extensions)
(use-package-ensure-system-package, Creating an extension): Fix
wording, punctuation, typos, and markup; add indexing.  Add
@group..@end group in code examples.