Fix #3307: Single PCI Standards link + drop ASVS 4.0 testing guide

Author: narfbg

5.0/en/0x91-Appendix-B_References.md

@@ -36,8 +36,4 @@ Similarly, the following websites are most likely to be useful to users/adopters
 
 1. SecLists Github: [https://github.com/danielmiessler/SecLists](https://github.com/danielmiessler/SecLists)
 2. MITRE Common Weakness Enumeration: [https://cwe.mitre.org/](https://cwe.mitre.org/)
-3. PCI Security Standards Council: [https://www.pcisecuritystandards.org/](https://www.pcisecuritystandards.org/)
-4. PCI Data Security Standard (DSS) v3.2.1 Requirements and Security Assessment Procedures: [https://www.pcisecuritystandards.org/documents/PCI_DSS_v3-2-1.pdf](https://www.pcisecuritystandards.org/documents/PCI_DSS_v3-2-1.pdf)
-5. PCI Software Security Framework - Secure Software Requirements and Assessment Procedures: [https://www.pcisecuritystandards.org/documents/PCI-Secure-Software-Standard-v1_0.pdf](https://www.pcisecuritystandards.org/documents/PCI-Secure-Software-Standard-v1_0.pdf)
-6. PCI Secure Software Lifecycle (Secure SLC) Requirements and Assessment Procedures: [https://www.pcisecuritystandards.org/documents/PCI-Secure-SLC-Standard-v1_0.pdf](https://www.pcisecuritystandards.org/documents/PCI-Secure-SLC-Standard-v1_0.pdf)
-7. OWASP ASVS 4.0 Testing Guide [https://github.com/BlazingWind/OWASP-ASVS-4.0-testing-guide](https://github.com/BlazingWind/OWASP-ASVS-4.0-testing-guide)
+3. PCI Security Standards: [https://www.pcisecuritystandards.org/standards/](https://www.pcisecuritystandards.org/standards/)