Tweak wording of 1.7.0 and 1.7.1 release notes

1.7.0 should be discouraged, 1.7.1 is safe (but basically pointless) to
upgrade to.

#2433

Author: icbaker

RELEASENOTES.md

@@ -6,13 +6,13 @@
 
 This release has the same code as 1.6.1 and is being released to ensure it
 appears as a 'newer' release than 1.7.0, which was an alpha release accidentally
-tagged as stable (see below). Please avoid using either of these releases. Stay
-on 1.6.1 and wait for 1.8.0-alpha01.
+tagged as stable (see below).
 
 ### 1.7.0 (2025-05-16)
 
 This release should have been `1.7.0-alpha01`, but was accidentally tagged
-`1.7.0` (i.e. stable) on maven.google.com.
+`1.7.0` (i.e. stable) on maven.google.com.  **Please do not use it.** Stay on
+1.6.1 or upgrade to 1.7.1 (which has the same code as 1.6.1).
 
 ## 1.6