Update example Lennon spouse

[mscuthbert]

See discussion at #880 (Fixes #880)

Only changed the index page, README, example 91, and spec latest -- left historical examples alone.

Thanks!

[davidlehn]

• I'd leave the /spec/latest/json-ld/ dir alone. That's mainly there for historical reasons.
• Similar with the extracted (or included?) bits in the /examples/syntax/ dir.
• If you wanted to update the example in the current specs, head over to https://github.com/w3c/json-ld-syntax/ to make a PR.
• It looks like the example leaked into many other files as well: https://github.com/search?q=repo%3Aw3c%2Fjson-ld-syntax%20lennon&type=code
• I still think it would be better to use an updated or different example that avoids complications. Even something like switching from "spouse" to "birthPlace".

[mscuthbert]

Followed suggestions and now just update the index.html and README.md files -- which are 99% of the viewer impressions.

Other examples can be created later, or further changed, definitely, but I'd like to advocate for json-ld to be used in the in-development next music notation encoding (MNX), but since it's a ''music'' project, it'd be great to get a fix in sooner rather than perfection later.

[BigBlueHat]

@mscuthbert thanks for the update!

However, to avoid all the entanglements with real people's lives, I'm considering changing this homepage example to...describe the homepage. 😄 Seems uncontroversial as well as a primary use case (SEO) for most folks exploring JSON-LD.

I do appreciate you caring about this, though, and I'd love to help you advocate for JSON-LD use in MNX (and beyond). 🚀