doc: fix typo in repl doc

PR-URL: https://github.com/nodejs/node/pull/8826
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/repl.md

@@ -416,8 +416,8 @@ The `repl.start()` method creates and starts a `repl.REPLServer` instance.
 ## The Node.js REPL
 
 Node.js itself uses the `repl` module to provide its own interactive interface
-for executing JavaScript. This can used by executing the Node.js binary without
-passing any arguments (or by passing the `-i` argument):
+for executing JavaScript. This can be used by executing the Node.js binary
+without passing any arguments (or by passing the `-i` argument):
 
 ```js
 $ node