Changes file for path use bias threshold changes.

changes/bug8161

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+ o Minor changes:
+   - Lower path use bias thresholds to .80 for notice and .60 for warn.
+     Fixes bug #8161; bugfix on 0.2.4.10-alpa.
+   - Make the rate limiting flags for the path use bias log messages
+     independent from the original path bias flags. Fixes bug #8161;
+     bugfix on 0.2.4.10-alpha.