doc: Fixed issuer url in okta docs

[pawan-mehta-dt]

Description

In Paid License or organization okta accounts /oauth2/default isn't enabled by default and the issuer url without /oauth2/default works for both organization as well as trial accounts as well as the recommended url for issuer

How Has This Been Tested?

• Tested on Okta trial account
• Tested on Okta organization account

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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