Merge pull request rails#13270 from aayushkhandelwal11/typos

typo rectified

Author: dmathieu

activesupport/lib/active_support/cache/file_store.rb

@@ -30,7 +30,7 @@ def clear(options = nil)
         FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
       end
 
-      # Premptively iterates through all stored keys and removes the ones which have expired.
+      # Preemptively iterates through all stored keys and removes the ones which have expired.
       def cleanup(options = nil)
         options = merged_options(options)
         search_dir(cache_path) do |fname|

activesupport/lib/active_support/cache/memory_store.rb

@@ -36,7 +36,7 @@ def clear(options = nil)
         end
       end
 
-      # Premptively iterates through all stored keys and removes the ones which have expired.
+      # Preemptively iterates through all stored keys and removes the ones which have expired.
       def cleanup(options = nil)
         options = merged_options(options)
         instrument(:cleanup, :size => @data.size) do