Fix two copy-paste typos from ComputeSharp

Fixes #69

Author: Sergio0694

.gitignore

@@ -341,4 +341,4 @@ ASALocalRun/
 samples/**/city_*.jpg
 
 # XML docs files
-src/**/ComputeSharp*.xml
+src/**/PolySharp*.xml

src/PolySharp.Package/PolySharp.Package.msbuildproj

@@ -20,7 +20,7 @@
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
-    <PackageProjectUrl>https://github.com/Sergio0694/ComputeSharp/</PackageProjectUrl>
+    <PackageProjectUrl>https://github.com/Sergio0694/PolySharp/</PackageProjectUrl>
     <PackageIcon>icon.png</PackageIcon>
     <PackageTags>dotnet net netcore netstandard csharp library generator polyfill roslyn</PackageTags>
     <DevelopmentDependency>true</DevelopmentDependency>