Intellisene completes on VersionSufix but the correct spelling should be VersionSuffix (which is what is respected by the CLI tooling).
Impacted line of code:
https://github.com/Microsoft/msbuild/blob/487db4a80806347f2f5ec8e41c7cf428dab06c92/src/MSBuild/Microsoft.Build.CommonTypes.xsd#L1802

Help text seems to be spelt correctly.

The shame, the shame! Thanks for the report.
Actually, I'm going to leave this open since we'll need to migrate the fix to the XSD that lives in the internal VS repo, since XSD localization isn't done here yet.
@AndyGerlicher We never got this ported over to VS. What branch should I target? vsuwpt?
This was ported already and will go out with VS Update 3.
Most helpful comment
The shame, the shame! Thanks for the report.