Tiny documentation edits [ci skip]

actionmailer/lib/action_mailer/base.rb

@@ -155,7 +155,7 @@ module ActionMailer
   # Note that <tt>deliver_later</tt> will execute your method from the background job.
   #
   # You never instantiate your mailer class. Rather, you just call the method you defined on the class itself.
-  # All instance method are expected to return a message object to be sent.
+  # All instance methods are expected to return a message object to be sent.
   #
   # = Multipart Emails
   #

actionview/lib/action_view/helpers/cache_helper.rb

@@ -39,7 +39,7 @@ module ActionView
       # This will include both records as part of the cache key and updating either of them will
       # expire the cache.
       #
-      # ==== Template digest
+      # ==== \Template digest
       #
       # The template digest that's added to the cache key is computed by taking an md5 of the
       # contents of the entire template file. This ensures that your caches will automatically
@@ -98,7 +98,7 @@ module ActionView
       #   <%# Template Dependency: todolists/todolist %>
       #   <%= render_sortable_todolists @project.todolists %>
       #
-      # The pattern used to match these is /# Template Dependency: ([^ ]+)/, 
+      # The pattern used to match these is <tt>/# Template Dependency: (\S+)/</tt>,
       # so it's important that you type it out just so.
       # You can only declare one template dependency per line.
       #