Adds missing "be" (elixir-lang#1410)

Author: gabrielmadruga

getting-started/mix-otp/config-and-releases.markdown

@@ -107,7 +107,7 @@ Note we removed `async: true` from `use ExUnit.Case`. Since the application envi
 
 ## Releases
 
-Now that our application runs distributed, you may wondering how can we package our application to run in production. After all, all of our code so far depends on Erlang and Elixir versions that are installed in your current system. To achieve this goal, Elixir provides releases.
+Now that our application runs distributed, you may be wondering how we can package our application to run in production. After all, all of our code so far depends on Erlang and Elixir versions that are installed in your current system. To achieve this goal, Elixir provides releases.
 
 A release is a self-contained directory that consists of your application code, all of its dependencies, plus the whole Erlang Virtual Machine (VM) and runtime. Once a release is assembled, it can be packaged and deployed to a target as long as the target runs on the same operating system (OS) distribution and version as the machine that assembled the release.