update alert-messages to follow the style-guide

Author: erik-krogh

swift/ql/src/queries/Security/CWE-311/CleartextStorageDatabase.ql

@@ -105,5 +105,5 @@ from CleartextStorageConfig config, DataFlow::PathNode sourceNode, DataFlow::Pat
 where config.hasFlowPath(sourceNode, sinkNode)
 select cleanupNode(sinkNode.getNode()), sourceNode, sinkNode,
   "This operation stores '" + sinkNode.getNode().toString() +
-    "' in a database. It may contain unencrypted sensitive data from $@", sourceNode,
+    "' in a database. It may contain unencrypted sensitive data from $@.", sourceNode,
   sourceNode.getNode().toString()

swift/ql/src/queries/Security/CWE-311/CleartextTransmission.ql

@@ -82,5 +82,5 @@ from CleartextTransmissionConfig config, DataFlow::PathNode sourceNode, DataFlow
 where config.hasFlowPath(sourceNode, sinkNode)
 select sinkNode.getNode(), sourceNode, sinkNode,
   "This operation transmits '" + sinkNode.getNode().toString() +
-    "', which may contain unencrypted sensitive data from $@", sourceNode,
+    "', which may contain unencrypted sensitive data from $@.", sourceNode,
   sourceNode.getNode().toString()