docs: fix incorrect policy permission guidelines for log collector

[ryoyanoamazon]

…ut AmazonSSMManagedInstanceCore

Issue #, if available:

Fixes: #1940

1. "IAM managed role AmazonSSMManagedInstanceCore" is not a role, it is an AWS managed role.
2. The IAM managed role AmazonSSMManagedInstanceCore does not have S3:PutObject permission to all S3 resources.

Description of changes:

1. Modify role into policy about AmazonSSMManagedInstanceCore.
2. Delete the documentation of The IAM managed role AmazonSSMManagedInstanceCore has S3:PutObject permission to all S3 resources and add an instruction to have the S3:PutObject permission to all S3 resources.

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[ndbaker1]

thanks! have one suggestion for wording