Changelog tweaks

Author: nicoddemus

changelog/8403.improvement.rst

@@ -1,5 +1,5 @@
 By default, pytest will truncate long strings in assert errors so they don't clutter the output too much,
 currently at ``240`` characters by default.
 
-However, in some cases the longer output helps, or even is crucial, to diagnose the problem. Using ``-v`` will
+However, in some cases the longer output helps, or is even crucial, to diagnose a failure. Using ``-v`` will
 now increase the truncation threshold to ``2400`` characters, and ``-vv`` or higher will disable truncation entirely.