Improve docs

Co-authored-by: Anders Schack-Mulligen <aschackmull@users.noreply.github.com>

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

@@ -110,7 +110,6 @@ private class StringBuilderVarExt extends StringBuilderVar {
    * this returns the append of `"3"`.
    */
   private StringBuilderAppend getAFirstAppendAfterAssignment() {
-    //
     result = this.getAnAppend() and not result = this.getNextAppend(_)
   }
 

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

@@ -1,5 +1,7 @@
 /**
  * Provides a taint-tracking configuration characterising request-forgery risks.
+ *
+ * Only import this directly from .ql files, to avoid the possibility of polluting the Configuration hierarchy accidentally.
  */
 
 import semmle.code.java.dataflow.FlowSources