Fix typo

Change-Id: I84ef63b6c82175132b376122253d3b262a065944
Reviewed-on: https://gerrit.libreoffice.org/70976
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

connectivity/source/cpool/ZConnectionPool.hxx

@@ -94,7 +94,7 @@ namespace connectivity
 
     typedef std::map< TDigestHolder,TConnectionPool,TDigestLess> TConnectionMap;
 
-    // contains additional information about a activeconnection which is needed to put it back to the pool
+    // contains additional information about an activeconnection which is needed to put it back to the pool
     typedef struct
     {
         TConnectionMap::iterator aPos;