changes: file for 31614

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+  o Minor bugfixes (logging):
+    - Disable backtrace signal handlers when shutting down tor.
+      Fixes bug 31614; bugfix on 0.2.5.2-alpha.
+    - Add a missing check for HAVE_PTHREAD_H, because the backtrace code uses
+      mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
+  o Documentation:
+    - Explain why we can't destroy the backtrace buffer mutex. Explain why
+      we don't need to destroy the log mutex.
+      Closes ticket 31736.