Fix typo (#4761)

Co-authored-by: Luffy <[email protected]>

Author: xabbuh

language/oop5/interfaces.xml

@@ -98,7 +98,7 @@
     The interface declaration applies only to public read and write access.
    </simpara>
    <simpara>
-    An class may satisfy an interface property in multiple ways.
+    A class may satisfy an interface property in multiple ways.
     It may define a public property.
     It may define a public
     <link linkend="language.oop5.property-hooks.virtual">virtual property</link>

reference/componere/componere/definition/construct.xml

@@ -89,7 +89,7 @@
   </warning>
   <warning>
    <para>
-    Shall throw <type>RuntimeException</type> if an class in <parameter>interfaces</parameter> is not an interface
+    Shall throw <type>RuntimeException</type> if a class in <parameter>interfaces</parameter> is not an interface
    </para>
   </warning>
  </refsect1>

reference/componere/componere/patch/construct.xml

@@ -52,7 +52,7 @@
   </warning>
   <warning>
    <para>
-    Shall throw <type>RuntimeException</type> if an class in <parameter>interfaces</parameter> is not an interface
+    Shall throw <type>RuntimeException</type> if a class in <parameter>interfaces</parameter> is not an interface
    </para>
   </warning>
  </refsect1>