Update branding to RC1 (#23943)

eng/Versions.props

@@ -9,14 +9,14 @@
     <AspNetCoreMajorVersion>5</AspNetCoreMajorVersion>
     <AspNetCoreMinorVersion>0</AspNetCoreMinorVersion>
     <AspNetCorePatchVersion>0</AspNetCorePatchVersion>
-    <PreReleaseVersionIteration>8</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <!--
         When StabilizePackageVersion is set to 'true', this branch will produce stable outputs for 'Shipping' packages
     -->
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>
-    <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseBrandingLabel>Preview $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
+    <PreReleaseVersionLabel>rc</PreReleaseVersionLabel>
+    <PreReleaseBrandingLabel>RC $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
     <IncludePreReleaseLabelInPackageVersion>true</IncludePreReleaseLabelInPackageVersion>
     <IncludePreReleaseLabelInPackageVersion Condition=" '$(DotNetFinalVersionKind)' == 'release' ">false</IncludePreReleaseLabelInPackageVersion>
     <AspNetCoreMajorMinorVersion>$(AspNetCoreMajorVersion).$(AspNetCoreMinorVersion)</AspNetCoreMajorMinorVersion>