Modifies the description of PUT inference OpenAI

[szabosteve]

Overview

This PR applies these changes to the description of the PUT inference OpenAI reference docs: elastic/elasticsearch#125419

[github-actions]

Following you can find the validation results for the API you have changed.

API	Status	Request	Response
inference.put_openai	⚪	Missing test	Missing test

You can validate this API yourself by using the make validate target.

[github-actions]

Following you can find the validation results for the API you have changed.

API	Status	Request	Response
inference.put_openai	⚪	Missing test	Missing test

You can validate this API yourself by using the make validate target.

[lcawl]

LGTM

[github-actions]

The backport to 8.17 failed:

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

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-8.17 8.17
# Navigate to the new working tree
cd .worktrees/backport-8.17
# Create a new branch
git switch --create backport-4066-to-8.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ae9958471166c553322a0cf92445729027a60438
# Push it to GitHub
git push --set-upstream origin backport-4066-to-8.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.17

Then, create a pull request where the base branch is 8.17 and the compare/head branch is backport-4066-to-8.17.