Add file-level qldoc

java/ql/src/Security/CWE/CWE-089/SqlInjectionLib.qll

@@ -1,3 +1,5 @@
+/** Definitions used by the queries for database query injection. */
+
 import java
 import semmle.code.java.dataflow.FlowSources
 import semmle.code.java.security.QueryInjection

java/ql/src/semmle/code/java/security/QueryInjection.qll

@@ -1,4 +1,4 @@
-/** Definitions used by the queries for database query injection. */
+/** Provides classes to reason about database query language injection vulnerabilities. */
 
 import java
 import semmle.code.java.dataflow.DataFlow