Update comments to Jetpack from JetPack.

[twstokes]

Fixes various comments that say "JetPack" rather than "Jetpack". 😄

I've also sent translation suggestions for the following languages where the string "JetPack" was found:

• German
• French
• Turkish
• Indonesian
• Portuguese

Regression Notes

1. Potential unintended areas of impact

   • N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   • N/A

3. What automated tests I added (or what prevented me from doing so)

   • N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19758-7a164de on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19758-7a164de on your iPhone

If you need access to App Center, please ask a maintainer to add you.