[ci] Improve wording in CI test reports

We weren't saying where to click, make it clear you click on a
test name.

.ci/generate_test_report_lib.py

@@ -92,7 +92,7 @@ def generate_report(
             ]
         )
     elif failures:
-        report.extend(["", "## Failed Tests", "(click to see output)"])
+        report.extend(["", "## Failed Tests", "(click on a test name to see its output)"])
 
         for testsuite_name, failures in failures.items():
             report.extend(["", f"### {testsuite_name}"])

.ci/generate_test_report_lib_test.py

@@ -2,6 +2,9 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+# To run these tests:
+# python -m unittest generate_test_report_lib_test.py
+
 import unittest
 from io import StringIO
 from textwrap import dedent
@@ -150,7 +153,7 @@ class TestReports(unittest.TestCase):
           * 2 tests failed
 
           ## Failed Tests
-          (click to see output)
+          (click on a test name to see its output)
 
           ### Bar
           <details>
@@ -182,7 +185,7 @@ class TestReports(unittest.TestCase):
         * 2 tests failed
 
         ## Failed Tests
-        (click to see output)
+        (click on a test name to see its output)
 
         ### ABC
         <details>