Typo; changed 'enviroment' to 'environment'

railties/guides/source/configuring.textile

@@ -414,7 +414,7 @@ Rails has 5 initialization events which can be hooked into (listed in order that
 
 * +to_prepare+: Run after the initializers are ran for all Railties (including the application itself), but before eager loading and the middleware stack is built.
 
-* +before_eager_load+: This is run directly before eager loading occurs, which is the default behaviour for the _production_ environment and not for the +development+ enviroment.
+* +before_eager_load+: This is run directly before eager loading occurs, which is the default behaviour for the _production_ environment and not for the +development+ environment.
 
 * +after_initialize+: Run directly after the initialization of the application, but before the application initializers are run.