Doc: fix arguments for startify#fortune#cowsay() example

doc/startify.txt

@@ -1061,18 +1061,16 @@ Use |startify-autocmd|:
 <
 ==============================================================================
 EXAMPLE                                                       *startify-example*
-
-This is my configuration..
 >
     autocmd User Startified setlocal cursorline
 
-    let g:startify_enable_special         = 0
-    let g:startify_files_number           = 8
-    let g:startify_relative_path          = 1
-    let g:startify_change_to_dir          = 1
-    let g:startify_update_oldfiles        = 1
-    let g:startify_session_autoload       = 1
-    let g:startify_session_persistence    = 1
+    let g:startify_enable_special      = 0
+    let g:startify_files_number        = 8
+    let g:startify_relative_path       = 1
+    let g:startify_change_to_dir       = 1
+    let g:startify_update_oldfiles     = 1
+    let g:startify_session_autoload    = 1
+    let g:startify_session_persistence = 1
 
     let g:startify_skiplist = [
             \ 'COMMIT_EDITMSG',
@@ -1087,7 +1085,7 @@ This is my configuration..
             \ ]
 
     let g:startify_custom_header =
-            \ startify#fortune#cowsay('═','║','╔','╗','╝','╚')
+            \ startify#fortune#cowsay('', '═','║','╔','╗','╝','╚')
 
     let g:startify_custom_footer =
            \ ['', "   Vim is charityware. Please read ':help uganda'.", '']