docs: fix dead links to the shared package

[rajanpanth]

Two README links to the @stylexjs/shared package 404, both treating shared as a directory inside babel-plugin when it's actually a sibling package:

File	Old (404)	New (200)
README.md	blob/main/packages/@stylexjs/babel-plugin/shared	tree/main/packages/@stylexjs/shared
packages/@stylexjs/eslint-plugin/README.md	.../babel-plugin/src/shared/utils/property-priorities.js	.../shared/src/utils/property-priorities.js

The root README one also used /blob/ for a directory; that's now /tree/.

The eslint-plugin link matters most — it's the reference readers follow to understand the sort-keys rule's property ordering, and right now it goes nowhere.

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