rurema/doctree

AI Summary: Remove trailing '.0' from `#@since` tags in the Japanese Ruby reference manual's doctree repository. This is necessary because the current format incorrectly indicates that features are available from a minor version later than intended (e.g., `3.0.0` is interpreted as starting from 3.1 instead of 3.0). The task involves finding and updating all instances of these tags.

AI Summary: Update the examples in the Japanese Ruby reference manual to reflect changes in output due to the replacement of `'` with `が` in certain methods like `caller`. This involves adding branches to the examples to handle the different output variations, referencing a provided pull request for guidance.