… examples. Include usage of expo-linear-gradient and Custom View Component in the Button

Motivation

Fixes # (issue)
Update the LinearGradient Docs usage, and also update the type of ViewComponent
from
typeof React.Component
to
React.ComponentType<any>

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested locally- No, build or test failures

• Jest Unit Test
• Checked with example app

Checklist

• [ x] My code follows the style guidelines of this project
• [ x] I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation using yarn docs-build-api
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• [x ] New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional context