Use title case and shorter notification text

[Tyriar]

Fixes #3236

PR Summary

Title says it

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[andyleejordan]

Thanks @Tyriar! Is there a handy guide for extension/editor consistencies like this I should refer to? Like VS Code extension "best practices."

[Tyriar]

There is actually and it's only like a month old: https://code.visualstudio.com/api/references/extension-guidelines

If you have any thoughts on the guide feel free to open issues under https://github.com/microsoft/vscode-docs

[andyleejordan]

Niiice, thank you!