Python: Fix grammar

Co-authored-by: yoff <lerchedahl@gmail.com>

Author: RasmusWL

python/ql/src/experimental/dataflow/internal/TaintTrackingPrivate.qll

@@ -35,9 +35,9 @@ predicate localAdditionalTaintStep(DataFlow::Node nodeFrom, DataFlow::Node nodeT
 /**
  * Holds if taint can flow from `nodeFrom` to `nodeTo` with a step related to concatenation.
  *
- * Note that since we cannot easily distinguish interesting types (like string, list, tuple), so
+ * Note that since we cannot easily distinguish interesting types (like string, list, tuple),
  * we consider any `+` operation to propagate taint. After consulting with the JS team, this
- * should doesn't sound like it is a big problem in practice.
+ * doesn't sound like it is a big problem in practice.
  */
 predicate concatStep(DataFlow::CfgNode nodeFrom, DataFlow::CfgNode nodeTo) {
   exists(BinaryExprNode add | add = nodeTo.getNode() |