REST: Unescape slashes in JSON examples

[adriendupuis]

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JSON examples were mixing escaped and not escaped slashes. This PR unify them as not escaped.

ECMA-404 "The JSON data interchange syntax" 2nd edition, December 2017 states:

All code points may be placed within the quotation marks except for the code points that must be escaped: quotation mark (U+0022), reverse solidus (U+005C), and the control characters U+0000 to U+001F. […] \/ represents the solidus character (U+002F).

So escaping the slash (a.k.a solidus) is optional; it doesn't matter.

% echo '{ "slash": "\/" }' | jq                                                                                     
{
  "slash": "/"
}

jq understands it but considers it's not worth keeping it.

Checklist

• [ ] Text renders correctly
• [ ] Text has been checked with vale
• [ ] Description metadata is up to date
• [ ] Redirects cover removed/moved pages
• [ ] Code samples are working
• [ ] PHP code samples have been fixed with PHP CS fixer
• [ ] Added link to this PR in relevant JIRA ticket or code PR