Add CLI Examples for CloudWatch Internet Monitor

[kocanaog]

Issue #, if available:

Description of changes:

Add CLI Examples for CloudWatch Internet Monitor. Link: https://docs.aws.amazon.com/cli/latest/reference/internetmonitor/#cli-aws-internetmonitor

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[kocanaog]

I fixed all the files with the new changes -

• Updated beginning lines to 'The following command example ~'
• For commands with no output, replaced 'This command returns to the prompt if successful.' with 'This command produces no output.'
• Provided 'For more information' sections in all files.

@elysahall