Apply suggestions from code review

Co-authored-by: Chris Smowton <smowton@github.com>

java/ql/src/experimental/Security/CWE/CWE-208/NonConstantTimeCheckOnSignatureQuery.qll

@@ -238,7 +238,7 @@ private predicate looksLikeConstant(Expr expr) {
  * Holds if `firstObject` and `secondObject` are compared using a method
  * that does not use a constant-time algorithm, for example, `String.equals()`.
  */
-private predicate isNonConstantEqualsCall(Expr firstObject, Expr secondObject) {
+private predicate isNonConstantTimeEqualsCall(Expr firstObject, Expr secondObject) {
   exists(NonConstantTimeEqualsCall call |
     firstObject = call.getQualifier() and
     secondObject = call.getAnArgument()

java/ql/src/semmle/code/java/dataflow/ExternalFlow.qll

@@ -257,7 +257,6 @@ private predicate sinkModelCsv(string row) {
     ]
 }
 
-// TODO: add ByteBuffer
 private predicate summaryModelCsv(string row) {
   row =
     [