Fix typo in pull request template

[kprosise]

Signed-off-by: John Toomey john@toganlabs.com

mion-docs

Summary

• Description: brief description of the bug that was fixed or the enhancement that was added
• Affected hardware: ALL -or- list specific switches
• Issue: #?

Build and test

• [ ] Build command: _e.g. mcbuild.sh ...
• [ ] Smoke tested on: e.g. stordis bf2556x-1t
• [ ] all other steps taken to validate the pull request

Checklist

• [ ] All relevant issues have been updated
• [ ] Reviewers have been added and a maintainer has been assigned
• [ ] A Label, Project and Milestone have all been added
• [ ] The relevant documentation/wiki/README have been updated and complies with the NGL Style and Communication Guide
• [ ] Git commits comply with the NGL Git Workflow and have DCO signoff
• [ ] Yocto code complies with the OpenEmbedded Style Guide