[bundler/bundler] Fix typo in binstubs documentation

rubygems/bundler@88dbfa18b4

man/bundle-binstubs.ronn

@@ -10,7 +10,7 @@ bundle-binstubs(1) -- Install the binstubs of the listed gems
 Binstubs are scripts that wrap around executables. Bundler creates a
 small Ruby file (a binstub) that loads Bundler, runs the command,
 and puts it into `bin/`. Binstubs are a shortcut-or alternative-
-to always using `bundle exec`. This gives you a file that can by run
+to always using `bundle exec`. This gives you a file that can be run
 directly, and one that will always run the correct gem version
 used by the application.