Salesforce Adapter Docs Update

Expanded the Salesforce adapter documentation with a complete operation reference and clearer onboarding/troubleshooting guidance for support teams.

Added

• Salesforce adapter reference — documented getCustomerDetails, openTicket, queryFromBot, and updateRecord with YAML usage, params, results, and failure behavior.
• Salesforce API links — added direct links to relevant REST API docs for query, create, and update flows.

Improved

• Salesforce onboarding guide — expanded support setup notes and troubleshooting material for OAuth and object/field discovery.
• Contact-field behavior clarity — clarified that contactObjectCustomFields replaces the default hardcoded Contact field list in lookups.