update BatchMode test to fully match the source range data

Author: QuietMisdreavus

test/SymbolGraph/Symbols/DocComment/BatchMode.swift

@@ -1,8 +1,10 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-build-swift %s -module-name BatchMode -emit-module-path %t/BatchMode.swiftmodule -emit-symbol-graph -emit-symbol-graph-dir %t -O -enable-batch-mode -incremental
+// RUN: %target-build-swift %s -module-name BatchMode -emit-module-path %t/BatchMode.swiftmodule -emit-symbol-graph -emit-symbol-graph-dir %t -O -enable-batch-mode
 // RUN: %FileCheck %s --input-file %t/BatchMode.symbols.json
 
+// changes to the doc comment cache created situations where building in batch mode caused symbol
+// graphs to lose source range information for individual doc comment lines.
+
+// CHECK: "range":{"start":{"line":[[# @LINE]],"character":4},"end":{"line":[[# @LINE]],"character":22}}
 /// This is some func.
 public func someFunc() {}
-
-// CHECK: range