Refer to the JsonPath RFC definition

[f3ath]

Description

Dart implementation of JsonPath strictly follows the RFC standard. Currently the documentation references a non-standard implementation with non-standard syntax (e.g. [?(@.size in ['M', 'L'])]) which is not supported by the Dart json_path package. This is confusing FF developers. This PR replaces the old link with the link to the current fully supported RFC standard.

Type of change

• [ ] Typo fix
• [ ] New feature
• [x] Enhancement to current docs
• [x] Removed outdated references
• [ ] Update assets

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[leighajarett]

Thanks so much for adding!