doc: fix guaranteed typo

Author: lilianakatrina684-a11y

doc/api/cli.md

@@ -4074,7 +4074,7 @@ that run in libuv's threadpool will experience degraded performance. In order to
 mitigate this issue, one potential solution is to increase the size of libuv's
 threadpool by setting the `'UV_THREADPOOL_SIZE'` environment variable to a value
 greater than `4` (its current default value). However, setting this from inside
-the process using `process.env.UV_THREADPOOL_SIZE=size` is not guranteed to work
+the process using `process.env.UV_THREADPOOL_SIZE=size` is not guaranteed to work
 as the threadpool would have been created as part of the runtime initialisation
 much before user code is run. For more information, see the [libuv threadpool documentation][].