Fix typo in docstring of arrays.OneDimensionalArray (#452)

Author: youknowqyh

pydatastructs/linear_data_structures/arrays.py

@@ -31,7 +31,7 @@ class OneDimensionalArray(Array):
         The elements in the array, all should
         be of same type.
     init: a python type
-        The inital value with which the element has
+        The initial value with which the element has
         to be initialized. By default none, used only
         when the data is not given.
     backend: pydatastructs.Backend