patch 8.0.1089: cannot get range count in user command
Problem: Cannot get range count in user command.
Solution: Add <range> argument.
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 983fb2d..f6bcde2 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1415,6 +1415,8 @@
<line1> The starting line of the command range.
*<line2>*
<line2> The final line of the command range.
+ *<range>*
+ <range> The number of items in the command range: 0, 1 or 2
*<count>*
<count> Any count supplied (as described for the '-range'
and '-count' attributes).