Fixed PHPDoc Blocks

These ```RunTimeExceptions``` are NOT the native ones, therefor the should not be ```\``` in front of them.
merged branch ChristianGaertner/patch-1 (PR #8887)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8887).

Discussion
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[Process] Fixed PHPDoc Blocks

These ```RunTimeExceptions``` are NOT the native ones, therefor the should not be ```\``` in front of them.

| Q             | A
| ------------- | ---
| Fixed tickets | none
| License       | MIT

Commits
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26e9717 Fixed PHPDoc Blocks