Remove adjective about what kind of number this is

Author: carols10cents

src/ch08-02-strings.md

@@ -244,7 +244,7 @@ encoded UTF-8 example strings from Listing 8-14. First, this one:
 In this case, `len` will be 4, which means the vector storing the string “Hola”
 is 4 bytes long. Each of these letters takes 1 byte when encoded in UTF-8. The
 following line, however, may surprise you. (Note that this string begins with
-the capital Cyrillic letter Ze, not the Arabic number 3.)
+the capital Cyrillic letter Ze, not the number 3.)
 
 ```rust
 {{#rustdoc_include ../listings/ch08-common-collections/listing-08-14/src/main.rs:russian}}