Left-Right Rotation

[Satyagovind]

Double rotations are slightly complex version of already explained versions of rotations. To understand them better, we should take note of each action performed while rotation. Let's first check how to perform Left-Right rotation. A left-right rotation is a combination of left rotation followed by right rotation.

• [x] I have read freeCodeCamp's contribution guidelines.
• [x] My pull request has a descriptive title (not a vague title like Update index.md)
• [x] My pull request targets the master branch of freeCodeCamp.
• [x] None of my changes are plagiarized from another source without proper attribution.
• [x] My article does not contain shortened URLs or affiliate links.

Closes #XXXXX