The migration guide was made with version 10/10.1. 10.0.2 did some changes render blocking scripts and shuch other optimizations.
Which makes the newer code from 10.0.15:
@* Bundle and minify jQuery. *@
@Html.RegisterScriptBundle(
bundleUrl: ScriptBundlePaths.SkinBundle,
urls: new[]
{
ScriptPaths.JQuery,
ScriptPaths.JQuery.AdnsfAlias,
})
@* Bundle and minify CSS. *@
@Html.RenderStyleBundle(
bundlePath: Url.SkinUrl("css/_skin_bundle"),
filePaths: new[]
{
Url.AppRelativeSkinUrl("less/bootstrap.css"),
Url.AppRelativeSkinUrl("less/themestyles.css"),
Url.AppRelativeSkinUrl("css/font-awesome.css"),
Url.AppRelativeSkinUrl("css/base.css"),
Url.AppRelativeSkinUrl("css/fonts.css"),
Url.AppRelativeSkinUrl("css/social-icons.css"),
Url.AppRelativeSkinUrl("css/payment-icons.css"),
Url.AppRelativeSkinUrl("css/custom.css"),
})
If possible it may be easier to copy the default skin folder and make modifications from there. That is what we did when converting our skins and it worked out well. Hope that at least helps.