Fix broken links in primer.md

Closes #4432

PiperOrigin-RevId: 592335698
Change-Id: I9859451981f58f1426255067d702a0767718b1d5
diff --git a/docs/primer.md b/docs/primer.md
index 8b98da2..0f90c03 100644
--- a/docs/primer.md
+++ b/docs/primer.md
@@ -73,8 +73,8 @@
 Exercise a particular program path with specific input values and verify the results | [TEST()](#simple-tests) | [Test Case][istqb test case]
 
 
-[istqb test case]: https://glossary.istqb.org/en/search/test%20case
-[istqb test suite]: https://glossary.istqb.org/en/search/test%20suite
+[istqb test case]: https://glossary.istqb.org/en_US/term/test-case-2
+[istqb test suite]: https://glossary.istqb.org/en_US/term/test-suite-1-3
 
 ## Basic Concepts