Fix IFS setting in doc deploy script (backport #1110)

[mergify]

This is an automatic backport of pull request #1110 done by Mergify.
Cherry-pick of 8fe22c9 has failed:

On branch mergify/bp/stable/0.4/pr-1110
Your branch is up to date with 'origin/stable/0.4'.

You are currently cherry-picking commit 8fe22c9.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   tools/deploy_documentation.sh

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[mtreinish]

@Mergifyio rebase

[mergify]

rebase

❌ Base branch update has failed

Git reported the following error:

Rebasing (1/2)
Auto-merging docs/release_notes.rst
CONFLICT (content): Merge conflict in docs/release_notes.rst
error: could not apply d579d66... Updated release notes config (#890)
hint: Resolve all conflicts manually, mark them as resolved with
hint: "git add/rm <conflicted_files>", then run "git rebase --continue".
hint: You can instead skip this commit: run "git rebase --skip".
hint: To abort and get back to the state before "git rebase", run "git rebase --abort".
Could not apply d579d66... Updated release notes config (#890)

err-code: DFD58