Fix typo and rewrap

Author: fhunleth

lib/nerves_key.ex

@@ -508,8 +508,9 @@ defmodule NervesKey do
   Return default provisioning info for a NervesKey
 
   This function is particularly useful for pre-programmed NervesKey devices.
-  Theserial number is a Base32-encoded version of the ATECC508A/608A's globally
-  unique serial number. No additional care is needed to keep the number unique.
+  The serial number is a Base32-encoded version of the ATECC508A/608A's
+  globally unique serial number. No additional care is needed to keep the
+  number unique.
 
   It also provides information about the provisioning mode. Helping identify a
   volatile configuration or custom, unrecognized configurations.