Update README.md (#2896)

plugin/file/README.md

@@ -80,7 +80,7 @@ not being correctly recognized:
 We omit the origin for the file `db.example.org`, so this references the zone in the server block,
 which, in this case, is the root zone. Any contents of `db.example.org` will then read with that
 origin set; this may or may not do what you want.
-It's better to be explicit here and specify the correct origin. This can be done in two ways:"
+It's better to be explicit here and specify the correct origin. This can be done in two ways:
 
 ~~~
 . {