Add link to default provider configuration definition

[nvanthao]

What

I'm adding link to default provider configuration definition in Providers Within Modules page

Why

To make it clear that Implicit Provider Inheritance is inclusive of un-aliased/ omitted provider block config.
The code example in above section only mentioned about un-aliased provider config.

provider "aws" {
  region = "us-west-1"
}

module "child" {
  source = "./child"
}

[hashicorp-cla]

All committers have signed the CLA.

[crw]

Thanks for this submission!

[laurapacilio]

Thank you! I have a suggestion for you to review :-)

[laurapacilio]

thank you! :-)

[crw]

@laurapacilio did you mean to merge this one?

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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