Add complete AWS credential examples to the allowable patterns

[scottschreckengaust]

Add short-term and long-term examples:

• ASIAIOSFODNN7EXAMPLE
• ASIAI44QH8DHBEXAMPLE
• AKIAI44QH8DHBEXAMPLE
• je7MtGbClwBF/2Zp9Utk/h3yCo8nvbEXAMPLEKEY

Viewing git secrets --list after git secrets --register-aws adds these two allowed:

git-secrets/git-secrets

Lines 242 to 243 in 5357e18

	add_config 'secrets.allowed' 'AKIAIOSFODNN7EXAMPLE'
	add_config 'secrets.allowed' "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"

There are more to be allowed, for example from https://docs.aws.amazon.com/cli/v1/userguide/cli-configure-files.html:

short term:

[default]
aws_access_key_id=ASIAIOSFODNN7EXAMPLE
aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
aws_session_token = IQoJb3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZVERYLONGSTRINGEXAMPLE

[user1]
aws_access_key_id=ASIAI44QH8DHBEXAMPLE
aws_secret_access_key=je7MtGbClwBF/2Zp9Utk/h3yCo8nvbEXAMPLEKEY
aws_session_token = fcZib3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZ2luX2IQoJb3JpZVERYLONGSTRINGEXAMPLE```

long-term:

[default]
aws_access_key_id=AKIAIOSFODNN7EXAMPLE
aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY

[user1]
aws_access_key_id=AKIAI44QH8DHBEXAMPLE
aws_secret_access_key=je7MtGbClwBF/2Zp9Utk/h3yCo8nvbEXAMPLEKEY