API correction in ``longest_increasing_subsequence`` function

[pratikgl]

Description of the problem

In the longest_increasing_subsequence function the output is a list instead of a OneDimensionalArray
(function) longest_increasing_subsequence: (array) -> list

pydatastructs/pydatastructs/linear_data_structures/algorithms.py

Line 983 in 0edbada

def longest_increasing_subsequence(array):

    ans = [] # this here should be an ODA instead of a list

    last_index = dp[length]
    while last_index != -1:
        ans[:0] = [array[last_index]]
        last_index = parent[last_index]
    return ans

I can work on it and will open a PR.

[czgdp1807]

There are a couple of documentation v/s code inconsistencies in lower_bound, upper_bound as well (for end, and comp variables). They should also be fixed.