[ci skip] Fix typo

activesupport/lib/active_support/deprecation/proxy_wrappers.rb

@@ -118,7 +118,7 @@ def warn(callstack, called, args)
     #
     #   PLANETS.map { |planet| planet.capitalize }
     #   # => DEPRECATION WARNING: PLANETS is deprecated! Use PLANETS_POST_2006 instead.
-    #        (Bactrace information…)
+    #        (Backtrace information…)
     #        ["Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"]
     class DeprecatedConstantProxy < DeprecationProxy
       def initialize(old_const, new_const, deprecator = ActiveSupport::Deprecation.instance)