Updated invalid comment syntax

[RichardWallis]

Updated invalid comment syntax in JSON-LD element of examples listed below.

Replaced:

<script type="application/ld+json">
  //Comment text
{

With:

<!-- Comment text -->
<script type="application/ld+json">
{

Process completed for 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

Fixes issue #2747

[danbri]

that's great :) nice to get some of these things fixed!