Add checks.md to documentation utils

Author: jaime-cespedes-sisniega

docs/source/api_reference/utils.md

@@ -5,6 +5,7 @@ The {mod}`frouros.utils` module contains auxiliary classes, functions or excepti
 ```{toctree}
 :maxdepth: 2
 
+utils/checks
 utils/data_structures
 utils/kernels
 utils/stats

docs/source/api_reference/utils/checks.md

@@ -0,0 +1,9 @@
+# Checks
+
+The {mod}`frouros.utils.checks` module contains auxiliary checks functions.
+
+```{eval-rst}
+.. automodule:: frouros.utils.checks
+    :members:
+    :no-inherited-members:
+```

frouros/utils/checks.py

@@ -5,7 +5,10 @@
 from frouros.callbacks.base import BaseCallback
 
 
-def check_callbacks(callbacks: Any, expected_cls: BaseCallback) -> None:
+def check_callbacks(
+    callbacks: Any,
+    expected_cls: BaseCallback,
+) -> None:
     """Check callbacks.
 
     :param callbacks: callbacks