Docs: added callable-array (#4079)

* Docs: added callable-array

* Update array_types.md

* Add non-empty-array

docs/annotating_code/type_syntax/array_types.md

@@ -118,3 +118,18 @@ Optional keys can be denoted by a trailing `?`, e.g.:
 ```php
 /** @return array{optional?: string, bar: int} */
 ```
+
+## Callable arrays
+
+a array holding a callable, like phps native `call_user_func()` and friends supports it:
+
+```php
+<?php
+
+$callable = ['myClass', 'aMethod'];
+$callable = [$object, 'aMethod'];
+```
+
+## non-empty-array
+
+a array which is not allowed to be empty

docs/annotating_code/type_syntax/atomic_types.md

@@ -31,6 +31,7 @@ Atomic types are the basic building block of all type information used in Psalm.
 - [list & non-empty-list](array_types.md#lists)
 - [list\<string\>](array_types.md#lists)
 - [array{foo: int, bar: string}](array_types.md#object-like-arrays)
+- [callable-array](array_types.md#callable-array)
 
 ## [Callable types](callable_types.md)