[CI][Docs] The docs job is failed by simdjson >= 4.0.0

[kou]

Describe the bug, including details regarding any error messages, version, and platform.

https://github.com/apache/arrow/actions/runs/30373474269/job/90323053472#step:7:533

CMake Error at cmake_modules/ThirdpartyToolchain.cmake:316 (message):
  Couldn't find simdjson >= 4.0.0
Call Stack (most recent call first):
  cmake_modules/ThirdpartyToolchain.cmake:2847 (resolve_dependency)
  CMakeLists.txt:529 (include)

Component(s)

Continuous Integration, Documentation

[raulcd]

This doesn't seem to be the case for the failure on the job anymore, seems to be fixed on main for simdjson.
From latest main, the failure:

https://github.com/apache/arrow/actions/runs/30534960567/job/90845938100

2 topics missing from index: "read_ipc_file" and "write_ipc_file".

-- Building pkgdown site for package arrow -------------------------------------
Reading from: /build/r
Writing to: /build/r/docs
-- Sitrep ----------------------------------------------------------------------
v URLs ok.
v Favicons ok.
v Open graph metadata ok.
v Articles metadata ok.
x Reference metadata not ok.
  In _pkgdown.yml, 2 topics missing from index: "read_ipc_file" and
  "write_ipc_file".
  Either add to the reference index, or use `@keywords internal` to drop from
  the index.
-- Initialising site -----------------------------------------------------------
-- Building home ---------------------------------------------------------------
Writing `authors.html`
Reading PACKAGING.md
Writing `PACKAGING.html`
Reading STYLE.md
Writing `STYLE.html`
Reading README.md
Writing `index.html`
Writing `404.html`
-- Building function reference -------------------------------------------------
Error: 
! in callr subprocess.
Caused by error in `build_reference_index(pkg)`:
! In _pkgdown.yml, 2 topics missing from index: "read_ipc_file" and
"write_ipc_file".
i Either add to the reference index, or use `@keywords internal` to drop from
  the index.
---
Standard error:

[thisisnic]

This doesn't seem to be the case for the failure on the job anymore, seems to be fixed on main for simdjson. From latest main, the failure:

https://github.com/apache/arrow/actions/runs/30534960567/job/90845938100

2 topics missing from index: "read_ipc_file" and "write_ipc_file".

-- Building pkgdown site for package arrow -------------------------------------
Reading from: /build/r
Writing to: /build/r/docs
-- Sitrep ----------------------------------------------------------------------
v URLs ok.
v Favicons ok.
v Open graph metadata ok.
v Articles metadata ok.
x Reference metadata not ok.
  In _pkgdown.yml, 2 topics missing from index: "read_ipc_file" and
  "write_ipc_file".
  Either add to the reference index, or use `@keywords internal` to drop from
  the index.
-- Initialising site -----------------------------------------------------------
-- Building home ---------------------------------------------------------------
Writing `authors.html`
Reading PACKAGING.md
Writing `PACKAGING.html`
Reading STYLE.md
Writing `STYLE.html`
Reading README.md
Writing `index.html`
Writing `404.html`
-- Building function reference -------------------------------------------------
Error: 
! in callr subprocess.
Caused by error in `build_reference_index(pkg)`:
! In _pkgdown.yml, 2 topics missing from index: "read_ipc_file" and
"write_ipc_file".
i Either add to the reference index, or use `@keywords internal` to drop from
  the index.
---
Standard error:

I'll make an R issue for this one, it's a quick fix

[kou]

#50717 fixed this.