Lint the code and docs

Author: przemyslawzalewski

array/any.md

@@ -11,6 +11,7 @@ Checks if the given array is present and it is not empty (contains at least one
 <!-- prettier-ignore-end -->
 
 ## Examples
+
 <!-- prettier-ignore-start -->
 ```javascript
 any([]); // ⇒ false

is/function.md

@@ -1,4 +1,4 @@
-# _function
+# \_function
 
 ## Type signature
 

object/merge.md

@@ -11,6 +11,7 @@ Merges two objects deeply.
 <!-- prettier-ignore-end -->
 
 ## Examples
+
 <!-- prettier-ignore-start -->
 ```javascript
 merge({ a: 1, b: 3 }, {}); // ⇒ { a: 1, b: 3 }