Changing default jump_to_def_vsplit again to <C-W><C-\>

Well, this is emberassing, but it turns out that the previous <C-W>} is
already taken. See :help CTRL-W_} (basically it's a hotkey for :ptag).
As far as I can tell the <C-W><C-\> is free.

README.md

@@ -99,12 +99,12 @@ You change any of them like this in your `vimrc`:
     let g:phpcomplete_mappings = {
       \ 'jump_to_def': ',g',
       \ }
-The keys you don't specify will be mapped the defaults. The defaults are:
+The keys you don't specify will be mapped to the defaults:
 
     let g:phpcomplete_mappings = {
        \ 'jump_to_def': '<C-]>',
        \ 'jump_to_def_split': '<C-W><C-]>',
-       \ 'jump_to_def_vsplit': '<C-W>}',
+       \ 'jump_to_def_vsplit': '<C-W><C-\>',
        \}
 
 **let g:phpcomplete\_add\_function\_extensions = [...]**<br>

ftplugin/php_phpcomplete.vim

@@ -22,11 +22,11 @@
 "					\ 'jump_to_def': ',g',
 "					\ }
 "
-"			The keys you don't specify will be mapped the defaults. The defaults are:
+"			The keys you don't specify will be mapped to the defaults:
 "				let g:phpcomplete_mappings = {
 "				 	\ 'jump_to_def': '<C-]>',
 "				 	\ 'jump_to_def_split': '<C-W><C-]>',
-"				 	\ 'jump_to_def_vsplit': '<C-W>}',
+"				 	\ 'jump_to_def_vsplit': '<C-W><C-\>',
 "					\}
 "
 "
@@ -38,7 +38,7 @@ let g:phpcomplete_enhance_jump_to_definition = get(g:, 'phpcomplete_enhance_jump
 let g:phpcomplete_mappings = extend({
 			\ 'jump_to_def': '<C-]>',
 			\ 'jump_to_def_split': '<C-W><C-]>',
-			\ 'jump_to_def_vsplit': '<C-W>}',
+			\ 'jump_to_def_vsplit': '<C-W><C-\>',
 			\}, get(g:, 'phpcomplete_mappings', {}))
 
 if g:phpcomplete_enhance_jump_to_definition