Consistently use indices over indexes

Most the the book pluralises index as indices, except in one place where it is pluralised as indexes. This chooses the more common "indices".
tnowacki · Feb 20, 2019 · 03611fc · 03611fc
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diff --git a/src/ch08-01-vectors.md b/src/ch08-01-vectors.md
@@ -203,7 +203,7 @@ programs from ending up in that situation.
 ### Iterating over the Values in a Vector
 
 If we want to access each element in a vector in turn, we can iterate through
-all of the elements rather than use indexes to access one at a time. Listing
+all of the elements rather than use indices to access one at a time. Listing
 8-8 shows how to use a `for` loop to get immutable references to each element
 in a vector of `i32` values and print them.