[TASK] Revise DataHandler introduction

[brotkrueml]

Releases: main, 12.4, 11.5

[garvinhicking]

Two minor code language hints, nothing blocking. Thanks! :)

[github-actions]

The backport to 11.5 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 16e41e7a... [TASK] Revise DataHandler introduction
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

Auto-merging Documentation/ApiOverview/DataHandler/Introduction/Index.rst
CONFLICT (content): Merge conflict in Documentation/ApiOverview/DataHandler/Introduction/Index.rst

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-11.5 11.5
# Navigate to the new working tree
cd .worktrees/backport-11.5
# Create a new branch
git switch --create backport-4171-to-11.5
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 16e41e7a5c0aac35eb22048181508c3d858e8e3b,72ceec452cc612054f57a34b3332017a121de7cd,d2b100982bf93fa5ee7bc1f8182c3ca04c69d9d4
# Push it to GitHub
git push --set-upstream origin backport-4171-to-11.5
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-11.5

Then, create a pull request where the base branch is 11.5 and the compare/head branch is backport-4171-to-11.5.