Added advanced optimization example using static loop unrolling

[mehdiataei]

Category

• [ ] New feature
• [ ] Bugfix
• [ ] Breaking change
• [ ] Refactoring
• [x] Documentation
• [ ] Other (please explain)

Description

Example for optimizing kernel generation using branching elimination with static loop unrolling added to the docs.

Changelog

• Example for branch elimination using static loop unrolling added

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• [x] Have you read the Contributor Guidelines?
• [ ] Have you written any new necessary tests?
• [x] Have you added or updated any necessary documentation?
• [x] Have you added any files modified by compiling Warp and building the documentation to this PR (.e.g. stubs.py, functions.rst)?
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