📖 Clarify that the ROSA provider is currently for ROSA HCP clusters

[mjlshen]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
The more explicit product name is ROSA HCP, see issue for more details

Which issue(s) this PR fixes:
Fixes #5257

Checklist:

• squashed commits
• includes documentation
• includes emojis

Release note:

NONE

[mjlshen]

/assign mzazrivec serngawy

Just as an fyi!

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In response to this:

/assign mzazrivec serngawy

Just as an fyi!

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[serngawy]

Thanks @mjlshen for the effort , Would you mind update the other docs as well. For example here at enabling ROSA HCP.

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[mjlshen]

Thanks @serngawy - I tried to take a more thorough pass through all the *.md files. Not sure if you would also like CRD descriptions updated, like

cluster-api-provider-aws/controlplane/rosa/api/v1beta2/rosacontrolplane_types.go

Line 137 in 07a93a5

// BillingAccount is an optional AWS account to use for billing the subscription fees for ROSA clusters.

[serngawy]

Thanks @serngawy - I tried to take a more thorough pass through all the *.md files. Not sure if you would also like CRD descriptions updated, like

cluster-api-provider-aws/controlplane/rosa/api/v1beta2/rosacontrolplane_types.go

Line 137 in 07a93a5

// BillingAccount is an optional AWS account to use for billing the subscription fees for ROSA clusters.

Thanks @mjlshen , the main focus is the md files but if you find places in CRDs that also can be fixed to ROSA-HCP that will be helpful.