Update READMEs.

Author: trekhleb

README.md

@@ -229,14 +229,14 @@ Below is the list of some of the most used Big O notations and their performance
 
 ### Array Sorting Algorithms Complexity
 
-| Name                  | Best      | Average   | Worst         | Memory    | Stable    | Comments  |
-| --------------------- | :-------: | :-------: | :-----------: | :-------: | :-------: | :-------- |
-| **Bubble sort**       | n         | n<sup>2</sup>       | n<sup>2</sup>           | 1         | Yes       |           |
-| **Insertion sort**    | n         | n<sup>2</sup>       | n<sup>2</sup>           | 1         | Yes       |           |
-| **Selection sort**    | n<sup>2</sup>       | n<sup>2</sup>       | n<sup>2</sup>           | 1         | No        |           |
-| **Heap sort**         | n log(n)  | n log(n)  | n log(n)      | 1         | No        |           |
-| **Merge sort**        | n log(n)  | n log(n)  | n log(n)      | n         | Yes       |           |
-| **Quick sort**        | n log(n)  | n log(n)  | n<sup>2</sup>           | log(n)    | No        |           |
-| **Shell sort**        | n log(n)  | depends on gap sequence   | n (log(n))<sup>2</sup>  | 1         | No        |           |
-| **Counting sort**     | n + r     | n + r     | n + r         | n + r     | Yes       | r - biggest number in array |
-| **Radix sort**        | n * k     | n * k     | n * k         | n + k    | Yes        | k - length of longest key |
+| Name                  | Best            | Average             | Worst               | Memory    | Stable    | Comments  |
+| --------------------- | :-------------: | :-----------------: | :-----------------: | :-------: | :-------: | :-------- |
+| **Bubble sort**       | n               | n<sup>2</sup>       | n<sup>2</sup>       | 1         | Yes       |           |
+| **Insertion sort**    | n               | n<sup>2</sup>       | n<sup>2</sup>       | 1         | Yes       |           |
+| **Selection sort**    | n<sup>2</sup>   | n<sup>2</sup>       | n<sup>2</sup>       | 1         | No        |           |
+| **Heap sort**         | n log(n)        | n log(n)            | n log(n)            | 1         | No        |           |
+| **Merge sort**        | n log(n)        | n log(n)            | n log(n)            | n         | Yes       |           |
+| **Quick sort**        | n log(n)        | n log(n)            | n<sup>2</sup>       | log(n)    | No        |           |
+| **Shell sort**        | n log(n)        | depends on gap sequence   | n (log(n))<sup>2</sup>  | 1         | No         |           |
+| **Counting sort**     | n + r           | n + r               | n + r               | n + r     | Yes       | r - biggest number in array |
+| **Radix sort**        | n * k           | n * k               | n * k               | n + k     | Yes       | k - length of longest key |