Fix CartCreate & CartEntryAdd RAML

[adriendupuis]

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JIRA Ticket
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Fix array usage and rebuild HTML after #2286

PHP associative array [ 'foo' => 'bar' ] is converted to JSON object { "boo": "bar" }. I tried to express that by keeping "associative array" in the description while typing it as an object.

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