docs: fix copyright text (#268)

Author: JamieMagee

Directory.Build.props

@@ -14,7 +14,7 @@
   <PropertyGroup Label="Package">
     <Authors>Microsoft</Authors>
     <Company>Microsoft</Company>
-    <Copyright>Copyright © Microsoft Corporation. All rights reserved.</Copyright>
+    <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/microsoft/component-detection</PackageProjectUrl>