Update java/ql/src/utils/flowtestcasegenerator/GenerateFlowTestCase.qll

Co-authored-by: Tony Torralba <[email protected]>

Author: michaelnebel

java/ql/src/utils/flowtestcasegenerator/GenerateFlowTestCase.qll

@@ -13,7 +13,7 @@ private import FlowTestCaseSupportMethods
 private import FlowTestCaseUtils
 
 /**
- * Gets a CSV row for which a test has been requested, and where there exist a summary, but
+ * Gets a CSV row for which a test has been requested, and where there exists a summary, but
  * nonetheless we can't generate a test case for it, indicating we cannot resolve either the callable
  * spec or an input or output spec.
  */