post 0.5.2 release adaptions

docs/lcdproc-user/bookinfo.docbook

@@ -72,7 +72,7 @@ Free Documentation License".
 <keywordset>
 <keyword>documentation</keyword>
 <keyword>LCDproc</keyword>
-<keyword>0.5.1</keyword>
+<keyword>0.5.2</keyword>
 <keyword>user's guide</keyword>
 </keywordset>