Move examples out of spec into an examples folder

[chalin]

This is a followup to:

• Add OTLP JSON payload examples #463

@tigrannajaryan @joaopgrassi, et al.: In #463, the examples were added to the spec, is that because the examples are they meant to be binding / enforce some sort of specification-related conformance? If not, they should be moved out of the spec folder IMHO, into, say, an examples folder.

Keep in mind that everything in the spec folder (hopefully to be renamed to docs via #469), will soon be published to the OTel website.

/cc @svrnm @cartermp

[joaopgrassi]

Hey @chalin

No, they are just examples nothing enforcing. I think it would be ok in moving them to another folder.