t5540-http-test: shorten grep pattern

diff --git a/RelNotes b/RelNotes
index 028ad79e1f7226088102667085ca5ceb43c4d442..17d37af54951e3179282cad837ee0beb271eb4e9 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.7.2.2.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.2.5.txt
\ No newline at end of file