Update docs for which-key

CHANGELOG.org

@@ -25,7 +25,8 @@
   (thanks to nashamri)
 - Add support for dotdirectory =~/.spacemacs.d= which behaves like the Emacs
   dotdirectory (i.e. =~/.spacemacs.d/init.el= is evaluated instead of
-  =~/.spacemacs= (thanks to justbur)
+  =~/.spacemacs= if the former exists and the latter does not) (thanks to
+  justbur)
 - Guide-key is replaced by =which-key= which is now the preferred live help
   package for key bindings (thanks to justbur)
 - Whole new API to manage the =powerline= mode-line. It is now possible to

README.md

@@ -455,7 +455,7 @@ function of a package.
 
 ## Key bindings discovery
 
-Thanks to [guide-key][], whenever a prefix command is pressed (like `SPC`)
+Thanks to [which-key][], whenever a prefix command is pressed (like `SPC`)
 a buffer appears after one second listing the possible keys for this prefix.
 
 It is also possible to search for specific key bindings by pressing:
@@ -598,8 +598,7 @@ details.
 [dotfile template]: ./core/templates/.spacemacs.template
 [install OSX section]: https://github.com/syl20bnr/spacemacs#os-x
 [osx layer]: contrib/osx/README.org
-[guide-key]: https://github.com/kai2nenobu/guide-key
-[guide-key-tip]: https://github.com/aki2o/guide-key-tip
+[which-key]: https://github.com/justbur/emacs-which-key
 [evil-nerd-commenter]: https://github.com/redguardtoo/evil-nerd-commenter
 [Gitter Chat]: https://gitter.im/syl20bnr/spacemacs
 [Gitter Chat IRC server]: https://irc.gitter.im/