C++: Add QLDoc on configuration modules where the original class had one

Author: jketema

cpp/ql/src/Security/CWE/CWE-020/ExternalAPIsSpecific.qll

@@ -61,6 +61,7 @@ deprecated class UntrustedDataToExternalApiConfig extends TaintTracking::Configu
 /** DEPRECATED: Alias for UntrustedDataToExternalApiConfig */
 deprecated class UntrustedDataToExternalAPIConfig = UntrustedDataToExternalApiConfig;
 
+/** A configuration for tracking flow from `RemoteFlowSource`s to `ExternalApiDataNode`s. */
 module UntrustedDataToExternalApiConfig implements DataFlow::ConfigSig {
   predicate isSource(DataFlow::Node source) {
     exists(RemoteFlowSourceFunction remoteFlow |

cpp/ql/src/Security/CWE/CWE-020/ir/ExternalAPIsSpecific.qll

@@ -56,6 +56,7 @@ deprecated class UntrustedDataToExternalApiConfig extends TaintTracking::Configu
 /** DEPRECATED: Alias for UntrustedDataToExternalApiConfig */
 deprecated class UntrustedDataToExternalAPIConfig = UntrustedDataToExternalApiConfig;
 
+/** A configuration for tracking flow from `RemoteFlowSource`s to `ExternalApiDataNode`s. */
 module UntrustedDataToExternalApiConfig implements DataFlow::ConfigSig {
   override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }