Updated word limit to 25 #299 (#300)

xml/docu_styleguide.language.xml

@@ -476,7 +476,7 @@
   <section xml:id="sec-structure-sentence">
     <title>Sentence structure</title>
     <para>
-      Form clear and direct sentences with 20 words or less. Avoid complicated
+      Form clear and direct sentences with 25 words or less. Avoid complicated
       clauses. Make sure that the relationship between subject, verb, and
       object is clear. Avoid joining sentences with semicolons. Avoid ending
       sentences with prepositions.