…tion

## Description
<!--- Describe your changes in detail -->
I found a typo in the documentation listed on the main page (https://pyswarms.readthedocs.io/en/latest/) under the Launching Pad section. The hyperlink provided to `use-cases examples` is incorrect.

## Related Issue
Fixes ljvmiranda921#524

## Motivation and Context


## How Has This Been Tested?
Removed the `examples` from the hyperlink and the webpage redirects to use cases correctly.

## Screenshots (if appropriate):

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
- [ ] 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 change)

## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
- [ ] My code follows the code style of this project.
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have read the **CONTRIBUTING** document.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

Fixes ljvmiranda921#524 <!--- Replace 524 with the appropriate issue number -->