patch 9.0.0647: the 'splitscroll' option is not a good name
Problem: The 'splitscroll' option is not a good name.
Solution: Rename 'splitscroll' to 'splitkeep' and make it a string option,
also supporting "topline". (Luuk van Baal, closes #11258)
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index 68b2eee..4d13a47 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -919,8 +919,8 @@
'spelloptions' 'spo' options for spell checking
'spellsuggest' 'sps' method(s) used to suggest spelling corrections
'splitbelow' 'sb' new window from split is below the current one
+'splitkeep' 'spk' determines scroll behavior for split windows
'splitright' 'spr' new window is put right of the current one
-'splitscroll' 'spsc' determines scroll behavior for split windows
'startofline' 'sol' commands move cursor to first non-blank in line
'statusline' 'stl' custom format for the status line
'suffixes' 'su' suffixes that are ignored with multiple match