DOC: unnamed TimeVaryingFunction in tutorial

[gdmcbain]

Working my way through the tutorial, there was a stumbling in the TimeVaryingFunction component.

Is this right?

ModelingToolkitStandardLibrary.jl/docs/src/tutorials/input_component.md

Line 25 in 2029edb

src = TimeVaryingFunction(f)

It raises (in Julia 1.10.0)

ERROR: LoadError: UndefKeywordError: keyword argument name not assigned

If it's @named:

    @named src = TimeVaryingFunction(f)

all's well.