Doc: update g:startify_custom_header example

doc/startify.txt

@@ -369,15 +369,16 @@ A programmatic example:
 A hardcoded example:
 >
     let g:startify_custom_header = [
-                \ '   __      ___            ______ ____   ',
-                \ '   \ \    / (_)           |____  |___ \ ',
-                \ '    \ \  / / _ _ __ ___       / /  __) |',
-                \ '     \ \/ / | | ''_ ` _ \     / /  |__ <',
-                \ '      \  /  | | | | | | |   / /   ___) |',
-                \ '       \/   |_|_| |_| |_|  /_(_) |____/ ',
-                \ '',
-                \ '',
-                \ ]
+            \ '                                 ________  __ __        ',
+            \ '            __                  /\_____  \/\ \\ \       ',
+            \ '    __  __ /\_\    ___ ___      \/___//''/''\ \ \\ \    ',
+            \ '   /\ \/\ \\/\ \ /'' __` __`\        /'' /''  \ \ \\ \_ ',
+            \ '   \ \ \_/ |\ \ \/\ \/\ \/\ \      /'' /''__  \ \__ ,__\',
+            \ '    \ \___/  \ \_\ \_\ \_\ \_\    /\_/ /\_\  \/_/\_\_/  ',
+            \ '     \/__/    \/_/\/_/\/_/\/_/    \//  \/_/     \/_/    ',
+            \ '',
+            \ '',
+            \ ]
 <
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                                                       *g:startify_custom_footer*