Fix invalid syntax for comments in JSON-LD examples

[RichardWallis]

Tests identified invalid comment syntax (eg. //Comment text) in the JSON-LD element of the following examples:

#eg-0118, #eg-0119, #eg-0120, #eg-0121, #eg-0122, #eg-0123, #eg-0124, #eg-0125, #eg-0126, #eg-0127, #eg-0128, #eg-0129, #eg-0130, #eg-0131, #eg-0132, #eg-0133, #eg-0134, #eg-0135, #eg-0136, #eg-0137, #eg-0138, #eg-0139, #eg-0140, #eg-0141, #eg-0142, #eg-0143, #eg-0144, #eg-0145, #eg-0146, #eg-0147, #eg-0148, #eg-0149, #eg-0150, #eg-0151, #eg-0152, #eg-0153, #eg-0154, #eg-0155, #eg-0156, #eg-0157, #eg-0158, #eg-0159, #eg-0160, #eg-0161, #eg-0162, #eg-0163, #eg-0164, #eg-0165

Needs updating to retain comments still visible in example window but in a valid syntax.

[RichardWallis]

Fixed by PR #2748