Correct adjective before possessive noun instead of after

**The Error**
I'm not sure how common this is but I just came across an example.

**Examples:**
1. experimenting with newest Neovim's built-in features and related plugins

**NOTE:** This is somewhat similar to #2331

The issue names no files, tests, or entry points. Start by reproducing the Neovim possessive-noun example in Harper and compare its diagnostic with the intended adjective placement; done means the grammar checker handles this construction correctly without regressing the related case in #2331.

Written by the indexing model from the issue text.