ext/intl: Add missing space (#5759)

Author: mmalferov

reference/intl/book.xml

@@ -63,7 +63,7 @@
     <simpara>
      Locale: provides interaction with locale identifiers in the form of
      functions to get subtags from locale identifier; parse, compose,
-     match(lookup and filter) locale identifiers.
+     match (lookup and filter) locale identifiers.
     </simpara>
    </listitem>
    <listitem>