Fix HTMLSizeThresholdError

[oyamad]

https://github.com/QuantEcon/QuantEcon.jl/actions/runs/7404372065/job/20145779620

[oyamad]

Still same error:

┌ Error: Generated HTML over size_threshold limit: api/QuantEcon.md
│     Generated file size: 267.54 (KiB)
│     size_threshold_warn: 100.0 (KiB)
│     size_threshold:      200.0 (KiB)
│     HTML file:           api/QuantEcon.html
└ @ Documenter.HTMLWriter ~/.julia/packages/Documenter/Bs999/src/html/HTMLWriter.jl:1862
ERROR: LoadError: HTMLSizeThresholdError: Some generated HTML files are above size_threshold.
See logged errors for details.
Stacktrace:
  [1] render(doc::Documenter.Document, settings::Documenter.HTMLWriter.HTML)
    @ Documenter.HTMLWriter ~/.julia/packages/Documenter/Bs999/src/html/HTMLWriter.jl:817
  [2] runner(#unused#::Type{Documenter.HTMLFormat}, fmt::Documenter.HTMLWriter.HTML, doc::Documenter.Document)
    @ Documenter ~/.julia/packages/Documenter/Bs999/src/writers.jl:23
  [3] dispatch(::Type{Documenter.FormatSelector}, ::Documenter.HTMLWriter.HTML, ::Vararg{Any, N} where N)
    @ Documenter.Selectors ~/.julia/packages/Documenter/Bs999/src/utilities/Selectors.jl:170
  [4] render(doc::Documenter.Document)
    @ Documenter ~/.julia/packages/Documenter/Bs999/src/writers.jl:45
  [5] runner(#unused#::Type{Documenter.Builder.RenderDocument}, doc::Documenter.Document)
    @ Documenter ~/.julia/packages/Documenter/Bs999/src/builder_pipeline.jl:266
  [6] dispatch(#unused#::Type{Documenter.Builder.DocumentPipeline}, x::Documenter.Document)
    @ Documenter.Selectors ~/.julia/packages/Documenter/Bs999/src/utilities/Selectors.jl:170
  [7] #89
    @ ~/.julia/packages/Documenter/Bs999/src/makedocs.jl:273 [inlined]
  [8] withenv(::Documenter.var"#89#91"{Documenter.Document}, ::Pair{String, Nothing}, ::Vararg{Pair{String, Nothing}, N} where N)
    @ Base ./env.jl:161
  [9] #88
    @ ~/.julia/packages/Documenter/Bs999/src/makedocs.jl:272 [inlined]
 [10] cd(f::Documenter.var"#88#90"{Documenter.Document}, dir::String)
    @ Base.Filesystem ./file.jl:106
 [11] #makedocs#87
    @ ~/.julia/packages/Documenter/Bs999/src/makedocs.jl:271 [inlined]
 [12] top-level scope
    @ ~/work/QuantEcon.jl/QuantEcon.jl/docs/make.jl:3
in expression starting at /home/runner/work/QuantEcon.jl/QuantEcon.jl/docs/make.jl:3