Fix missing space (#4345)

Author: sy-records

language/oop5/property-hooks.xml

@@ -196,7 +196,7 @@ class Example
    or a short-set with an explicit type, or so on is all valid.
   </simpara>
   <simpara>
-   On a backed property, omitting a <literal>get</literal> or<literal>set</literal>
+   On a backed property, omitting a <literal>get</literal> or <literal>set</literal>
    hook means the default read or write behavior will be used.
   </simpara>
   <note>