SW REST API Error Codes reformatting

[Manny-r31]

Documentation Update Pull Request

Description

adjusted tables to API fields, manually defined slug for page

Type of Change

• Update to existing documentation

Documentation Change Details

• Changes Summary: adjusted tables to API fields, manually defined slug for https://developer.signalwire.com/rest/signalwire-rest/overview/error-codes

Motivation and Context

• Solves [DOC] - Update RELAY Rest Error Codes to CXML Error Code Format #608

• Ensures that it matches cXML Error code formatting

Checklist:

• My documentation follows the style guidelines of this project
• I have performed a self-review of my documentation
• My changes generate no new warnings
• Builds successfully locally

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