Bump sphinxcontrib-phpdomain from 0.6.0 to 0.6.2 (#6208)

Bumps [sphinxcontrib-phpdomain](https://github.com/markstory/sphinxcontrib-phpdomain) from 0.6.0 to 0.6.2.
- [Release notes](https://github.com/markstory/sphinxcontrib-phpdomain/releases)
- [Changelog](https://github.com/markstory/sphinxcontrib-phpdomain/blob/master/CHANGES)
- [Commits](https://github.com/markstory/sphinxcontrib-phpdomain/commits/0.6.2

)

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