Update annotated model in README

[koeda-ta]

Thank you for developing and maintaining this great gem.

I usually use annotate, but while reading the AnnotateRb documentation, I noticed a section that might be slightly confusing for beginners. I’ve made a small change to address this. Could you please take a look and let me know what you think?

Changes

I changed the model file name in the README example as follows:

- # Annotated (1): app/models/task.rb
+ # Annotated (1): app/models/user.rb

Reason

Since the environment variable ANNOTATERB_SKIP_ON_DB_TASKS is introduced immediately after task.rb, readers might assume that task.rb and DB_TASKS are related.

However, task.rb is the name of a model file, while DB_TASKS refers to database-related Rake tasks. The two are unrelated.

Additionally, the User model is already used as an example in the “Preserving class documentation comments” section of the README. Using user.rb here as well helps avoid confusion and keeps the examples consistent throughout the documentation.