Fixed a typo (remove extra n)

doc/ci/runners/README.md

@@ -128,7 +128,7 @@ the appropriate dependencies to run Rails test suites.
 ### Prevent runner with tags from picking jobs without tags
 
 You can configure a runner to prevent it from picking jobs with tags when
-the runnner does not have tags assigned. This setting is available on each
+the runner does not have tags assigned. This setting is available on each
 runner in *Project Settings* > *Runners*.
 
 ### Be careful with sensitive information