Update README.md

Author: mikemorris

cmd/changelog-entry/README.md

@@ -30,4 +30,4 @@ monitoring: optimize the monitoring endpoint to avoid losing logs when under hig
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-Any failures will be logged to stderr. The entry will be written to a file named `{PR_NUMBER}.txt`, in the current directory unless an output path is specified.
+Any failures will be logged to stderr. The entry will be written to a file named `{PR_NUMBER}.txt`, in the current directory unless an output directory is specified.