fix typo

docs/reference/configuration/monitoring/sentry.md

@@ -26,7 +26,7 @@ sentry:
 The `monitor_slug` value comes from the "Monitor Slug" under "Cron Details" on
 the same Sentry monitor page.
 
-The `environment` value optionally specifies the enviroment that is used in
+The `environment` value optionally specifies the environment that is used in
 Sentry.
 
 With this configuration, borgmatic pings Sentry whenever borgmatic starts,