Add missing QlDoc.

ql/src/semmle/go/security/RequestForgery.qll

@@ -1,10 +1,18 @@
 /**
  * Provides a taint-tracking configuration for reasoning about request forgery
  * (SSRF) vulnerabilities.
+ *
+ * Note, for performance reasons: only import this file if
+ * `RequestForgery::Configuration` is needed, otherwise
+ * `RequestForgeryCustomizations` should be imported instead.
  */
 
 import go
 
+/**
+ * Provides a taint-tracking configuration for reasoning about request forgery
+ * (SSRF) vulnerabilities.
+ */
 module RequestForgery {
   import RequestForgeryCustomizations::RequestForgery
 

ql/src/semmle/go/security/SafeUrlFlow.qll

@@ -9,6 +9,10 @@
 
 import go
 
+/**
+ * Provides a taint-tracking configuration for reasoning about
+ * safe flow from URLs.
+ */
 module SafeUrlFlow {
   import SafeUrlFlowCustomizations::SafeUrlFlow
 

ql/src/semmle/go/security/SafeUrlFlowCustomizations.qll

@@ -5,6 +5,10 @@
 
 import go
 
+/**
+ * Provides extension points for customizing the taint-tracking configuration for reasoning about
+ * safe URL flow.
+ */
 module SafeUrlFlow {
   /** A sink for safe URL flow. */
   abstract class Sink extends DataFlow::Node { }