Fix typo in public_activity initializer comment (#938)

## Summary
- fix comment to correctly reference `better_together`

## Testing
- `bundle exec rspec` *(fails: `bundle` not found)*

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https://chatgpt.com/codex/tasks/task_e_6886d1c656588321be5031f409282085

Author: rsmithlal

config/initializers/public_activity.rb

@@ -2,7 +2,7 @@
 
 # config/initializers/public_activity.rb
 
-# require 'better_togehter/privacy'
+# require 'better_together/privacy'
 
 ActiveSupport::Reloader.to_prepare do
   PublicActivity::Config.set do