website: Small markdown formatting fix

[dbirks]

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Release note for CHANGELOG:

Fix aws_codedeploy_deployment_group auto_rollback_configuration markdown formatting

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -count 1 -parallel 20 -run=TestAccXXX -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
testing: warning: no tests to run
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       0.016s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws/internal/flatmap      0.006s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws/internal/keyvaluetags 0.004s [no tests to run]

[gdavison]

LGTM 👍

[ghost]

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