Explain that Blade fluent tags don't have context

[jasonvarga]

Regarding conversation here: statamic/cms#11247

Blade fluent tags don't automatically get the context, and some tags rely on the context.

For example, the locales tag needs to know the ID. In Antlers it can just grab the nearest id from the available variables, but since Blade is just PHP, it's not as magical so you need to pass it in.

On the Blade tags page we should mention that context might be necessary on some tags. And, on those tag pages we could consider explaining whenever things are retrieved from context and note what's needed to be done when using Blade fluent tags.