Enhance algorithms explanation

[rbrox]

Description

• Added a recurrence relation to provide deeper insight into the time complexity analysis.
• Addressed minor alignment issues for improved readability.

Files/Paths Affected:

• en/Sorting Algorithms/Merge Sort.md

Checklist

• [Y] A description of the changes in this PR is mentioned above.
• [Y] All the new and existing checks pass.
• [Y] No plagiarized, duplicated, or repetitive documentation that has been directly copied from another source.
• [Y] If it's a new explanation, it contains solid, understandable, and accessible information.
• [Y] I have read the whole contributing guidelines and agree to the Code of Conduct.

| Original |

| Updated |

Note to reviewers

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[github-actions[bot]]

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