Fix installation docs on monitor configuration

[ricardocardante]

Description

The installation docs refers to a monitorConfiguration configuration node that does not exist. Instead, it should be documented as monitor.

Additional context and related issues

Currently if the trino-gateway user tries to use the monitorConfiguration property it will fail on the deploy with an error like the following:

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required. Please propose a release note for me.
( ) Release notes are required, with the following suggested text:

[cla-bot]

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[mosabua]

Please submit a signed CLA .. code change looks good and we will wait for CLA processing with merge.

[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[ricardocardante]

Please submit a signed CLA .. code change looks good and we will wait for CLA processing with merge.

Thanks, @mosabua.
Added a new change - 9cc9141 - discussed in #621.

CLA submitted, waiting for @martint's validation.

Thank you!

[oneonestar]

Thanks for the fix.
I think L440-L444 should also be moved to the section above(L430).

trino-gateway/docs/installation.md

Lines 440 to 444 in e0493ae

	```yaml
	backendState:
	username: "user"
	password: "password"
	```

[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[ricardocardante]

Thanks for the fix. I think L440-L444 should also be moved to the section above(L430).

trino-gateway/docs/installation.md

Lines 440 to 444 in e0493ae

	```yaml
	backendState:
	username: "user"
	password: "password"
	```

Done ✅ 0210c75

[oneonestar]

@cla-bot check

[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

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