docs: Add description for NEW_RELIC_CLOUD_AWS_ACCOUNT_ID

[aavinash-nr]

Description:

What does this PR do?

This PR introduces documentation for the NEW_RELIC_CLOUD_AWS_ACCOUNT_ID environment variable, which was previously undocumented.

Why is this change needed?

The purpose of the NEW_RELIC_CLOUD_AWS_ACCOUNT_ID variable was unclear without documentation. Adding this description helps users understand that this variable is essential for New Relic to correctly map entity relationships between monitored AWS resources (like databases and Lambda functions). This will improve the configuration experience and prevent setup errors.

Added Documentation

The following description has been added:

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  Provide the AWS Account ID where your monitored resources (e.g., databases, Lambda functions) are located. This allows New Relic to correctly map and display relationships between these monitored entities.
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[github-actions]

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[tejaswaroop-nr]

Suggested change

	Provide the AWS Account ID where your monitored resources (e.g., databases, Lambda functions) are located. This allows New Relic to correctly map and display relationships between these monitored entities.
	To help New Relic correctly map and display relationships between your monitored entities, provide the AWS Account ID where your monitored resources, such as databases and Lambda functions.