Fix typo WRT first Zebra version that supported ICU

diff --git a/doc/field-structure.xml b/doc/field-structure.xml
index 98c4183..1387f3b 100644 (file)
--- a/doc/field-structure.xml
+++ b/doc/field-structure.xml
@@ -29,7 +29,7 @@
   </para>
 
   <para>
-   Version 2.1 of Zebra can also be configured - per field - to use the
+   Version 2.0.20 of Zebra can also be configured - per field - to use the
    <ulink url="&url.icu;">ICU</ulink> library to perform tokenization and
    normalization of strings. This is an alternative to the "charmap"
    files which has been part of Zebra since its first release.