Fix resource update for 'awx_credential'

[NikolayDupak]

There was bug with resource 'awx_credential' with field 'inputs'.
AWX credential has field 'inputs' and it's type string, but in the rest api documentation has type JSON.

Issue:
After apply terraform state for awx_credential with already created resources, failed because AWX api returned value for 'inputs' with type 'map[string]interface{}'.

Changed:

• type for 'inputs' field, from string to map[string]interface{}
• removed unmarshal for 'inputs' field

Fixed:

• used correct return function in 'resourceCredentialUpdate', changed from 'resourceCredentialSCMRead' to 'resourceCredentialRead'

[josh-silvas]

Approved, however, the documentation needs to be updated. Can you run make docs to update the documentation for this change and add to the PR?

[josh-silvas]

Thanks @NikolayDupak, releasing this as v1.0.8 shortly.

[josh-silvas]

Released : https://registry.terraform.io/providers/josh-silvas/awx/1.0.8/docs