docs: documented 'octal_string_to_int'

.wiki/Kernel-documentation.md

@@ -1010,6 +1010,9 @@ Returns the power of `base ^ exponent`.
 #### `abs(number)` - function (uint64_t)
 Returns the absolute value of **_number_**.
 
+#### `octal_string_to_int(string, size)` - function (uint64_t)
+Converts a base-8 **_string_** with length **_size_** into an integer and returns it.
+
 ### memory.h
 Basic memory functionalities.