fix typo

db/db.spec

@@ -71,7 +71,7 @@ AutoReqProv:  no
         regex     = db-(__VER__)\.tar\.gz
     }
     prog db:patch = {
-        comment   = "thl: change tracking from hardcode to variable once a patch is availble"
+        comment   = "thl: change tracking from hardcode to variable once a patch is available"
         version   = 4.3.28
         url       = http://www.sleepycat.com/download/db/index.shtml
         regex     = patch\.(__VER__\.\d+)\.html