Changed canonical_url to relative_url

[yogeshsuhagiya]

Description (*)

As per the devdoc, there must be a relative_url instead of canonical_url.

• https://devdocs.magento.com/guides/v2.3/graphql/reference/url-resolver.html

Fixed Issues (if relevant)

1. N/A

Manual testing scenarios (*)

1. Try to execute following GraphQl query as explain in docs.
   { urlResolver(url:"joust-duffle-bag.html") { id relative_url type } }
2. It throws following error:
   { "errors": [ { "message": "Cannot query field \"relative_url\" on type \"EntityUrl\".", "category": "graphql", "locations": [ { "line": 4, "column": 4 } ] } ] }

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[yogeshsuhagiya]

Hello @magento-engcom-team, can you please review this PR?

[TomashKhamlai]

@yogeshsuhagiya, could you take a look on this #436 ?

[yogeshsuhagiya]

Hi @TomashKhamlai, checked the issue and it looks good.

[TomashKhamlai]

@yogeshsuhagiya would you like to create a PR for this problem?
There are 2-3 similar problems solved in previous 2 month. Solution is usually as simple as coverage assertions.

[yogeshsuhagiya]

Hi @TomashKhamlai, yes sure. I like to create PR.

[ghost]

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