Update doc

README.md

@@ -771,9 +771,10 @@ of the array if needed.
 
 Resize the array 'array' to the size 'size' (initializing or clearing elements).
 
-#####void array\_name\_shrink\_to\_fit(array\_name\_t array)
+##### void array\_name\_reserve(array\_name\_t array, size\_t capacity)
 
-Resize the array 'array' to its exact needed size.
+Extend or reduce the capacity of the 'array' to a rounded value based on 'capacity'.
+If the given capacity is below the current size of the array, the capacity is set to the size of the array.
 
 ##### void array\_name\_pop\_at(type *dest, array\_name\_t array, size\_t key)