Fix Doc for chat model property

[themanojshukla]

The documentation mentioned incorrectly for the spring properties options for setting chat model.

[markpollack]

@themanojshukla please use -s to sign the commit git commit --amend -s --no-edit and repush the PR

[markpollack]

@themanojshukla We recently switch from a CLA contributor approach to the DCO. Can you sign the commit and repush.

git config --global user.name "Your Name"
git config --global user.email "[email protected]"

go to PR branch

git commit --amend --signoff
git push --force

[themanojshukla]

Sure @markpollack I'll sign and update it.