patch 8.1.0858: 'indentkeys' and 'cinkeys' defaults are different

Problem:    'indentkeys' and 'cinkeys' defaults are different.
Solution:   Make them the same, update docs. (close #3882)
diff --git a/src/version.c b/src/version.c
index f7dd664..9422f84 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    858,
+/**/
     857,
 /**/
     856,