[ios] Update CreateSyntheticCrashReportForUte test comment

This is a follow up for the following comment:
https://chromium-review.googlesource.com/c/chromium/src/+/2410302/1/ios/chrome/browser/crash_report/synthetic_crash_report_util_unittest.mm#86

Bug: 1103752
Change-Id: If5e0d97dadbb07705d59e3814b0b10f38f92d2a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425114
Auto-Submit: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809600}

ios/chrome/browser/crash_report/synthetic_crash_report_util_unittest.mm

@@ -92,7 +92,7 @@ TEST_F(SyntheticCrashReportUtilTest, CreateSyntheticCrashReportForUte) {
       config_content, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 
   // Verify config file content. Config file has the following format:
-  // Key1\nValue1Length\nValue1\n...KeyN\nValueNLength\nValueN
+  // <Key1>\n<Value1Length>\n<Value1>\n...<KeyN>\n<ValueNLength>\n<ValueN>
   ASSERT_EQ(33U, config_lines.size())
       << "<content>" << config_content << "</content>";