Update prometheus.exporter.cloudwatch.md

[diegobelotti]

aws_sdk_version_v2 is bool, using quotes return a fatal error on start:

Oct 09 09:33:59 ansible alloy[10120]: Error: /etc/alloy/config.alloy:236:35: "true" should be bool, got string Oct 09 09:33:59 ansible alloy[10120]: 235 | sts_region = "eu-west-1" Oct 09 09:33:59 ansible alloy[10120]: 236 | aws_sdk_version_v2 = "true" Oct 09 09:33:59 ansible alloy[10120]: | ^^^^^^ Oct 09 09:33:59 ansible alloy[10120]: 237 | discovery_exported_tags = { Oct 09 09:33:59 ansible alloy[10120]: ts=2024-10-09T07:33:59.106222763Z level=error msg="failed to start reporter" err="context canceled" Oct 09 09:33:59 ansible alloy[10120]: Error: could not perform the initial load successfully

PR Description

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• [ ] CHANGELOG.md updated
• [ ] Documentation added
• [ ] Tests updated
• [ ] Config converters updated