[Valgrind-developers] [valgrind] Update README.s390

[Andreas A. <ar...@so...>]

https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=e0243e604e35efc26b06226cb2736f43ad97196b

commit e0243e604e35efc26b06226cb2736f43ad97196b
Author: Andreas Arnez <ar...@li...>
Date:   Tue Oct 1 13:20:29 2024 +0200

    Update README.s390
    
    The link to the "z/Architecture Principles of Operation" document is out
    of date.  Update it.

Diff:
---
 README.s390 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.s390 b/README.s390
index 86f867188a..528eafc5cc 100644
--- a/README.s390
+++ b/README.s390
@@ -42,6 +42,6 @@ Reading Material
 (1) ELF ABI s390x Supplement
     https://github.com/IBM/s390x-abi/releases
 (2) z/Architecture Principles of Operation
-    https://www.ibm.com/support/pages/zarchitecture-principles-operation
-(3) z/Architecture Reference Summary
-    https://www.ibm.com/support/pages/zarchitecture-reference-summary
+    https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf
+(3) Collection of z/Architecture publications
+    https://linux.mainframe.blog/zarchitecture-principles-of-operation/