Additional examples for array shape syntax

[kczx3]

intelephense-docs/gettingStarted.md

Line 425 in 3e810bc

* `array<int, ElementType>`

As shown in this issue, bmewburn/vscode-intelephense#3168, it would be helpful if you included the following as an example of possible syntax to define fixed keys and their respective value types.

@param array{name: string, age: int} $myParam