Added linemarkers for test fixtures

[VitaliyBoyko]

Description (*)
Added line markers to @magentoDataFixture and @magentoApiDataFixture PHPDoc tag values for easier navigation from a test class to a fixture file.

Fixed Issues (if relevant)

1. Fixes Reference. Integration / API Functional tests fixtures location #40

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 integration/functional tests (if applicable)
• All automated tests passed successfully (all builds are green)

[eduard13]

Thank you for this feature, a really great one 👍.

[apedicdev]

Hi, should this work for custom classes as well?