patch 9.0.0196: finding value in list may require a for loop

Problem:    Finding value in list may require a for loop.
Solution:   Add indexof(). (Yegappan Lakshmanan, closes #10903)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index c1f74d6..1938e35 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -792,14 +792,16 @@
 	reduce()		reduce a List to a value
 	slice()			take a slice of a List
 	sort()			sort a List
-	reverse()		reverse the order of a List
+	reverse()		reverse the order of a List or Blob
 	uniq()			remove copies of repeated adjacent items
 	split()			split a String into a List
 	join()			join List items into a String
 	range()			return a List with a sequence of numbers
 	string()		String representation of a List
 	call()			call a function with List as arguments
-	index()			index of a value in a List
+	index()			index of a value in a List or Blob
+	indexof()		index in a List or Blob where an expression
+				evaluates to true 
 	max()			maximum value in a List
 	min()			minimum value in a List
 	count()			count number of times a value appears in a List