Replace `Github` with `GitHub` in github-actions/trigger-issue/add-missing-labels-to-issues/add-labels-template.md

### Prerequisite
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### Overview
We need to replace instances of `Github` and `github` with `GitHub` so that we display the company name correctly.

### Action Items
- [ ] Open `github-actions/trigger-issue/add-missing-labels-to-issues/add-labels-template.md` in your IDE
- [ ] Change
```
To add a label, take a look at Github's documentation [here](https://docs.github.com/en/issues/using-labels-and-milestones-to-track-work/managing-labels#applying-a-label).
```
to
```
To add a label, take a look at GitHub's documentation [here](https://docs.github.com/en/issues/using-labels-and-milestones-to-track-work/managing-labels#applying-a-label).
```
- [ ] Add/commit changes then create Pull Request as usual

### Resources
- This issue resulted from #6161

### Merge Team
- [ ] After closing this issue, check off the dependency in #6161. If all dependencies have been completed, close #6161