Fix build parallelism issue with documentation file generation #22232
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Use GenerateDocumentationFile=true instead of DocumentationFile=$(IntermediateOutputPath)$(AssemblyName).xml. This lets the SDK pick the appropriate path.
At the point where the explicit DocumentationFile was being evaluated, the intermediate output path had not yet gotten the TargetFramework appended. As such, parallel builds of the different TargetFrameworks of a multi-targeted project were trying to write the documentation xml to the same intermediate location.