docs: fixing broken links to security concepts

[haleychaas]

Summary

Fixing a link I broke a while ago. These do redirect, but it's cleaner (and eliminates warnings in our docs repo build) to fix them.

Testing

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.14%. Comparing base (74a9330) to head (5126514).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1896   +/-   ##
=======================================
  Coverage   84.14%   84.14%           
=======================================
  Files         117      117           
  Lines       13356    13356           
=======================================
  Hits        11238    11238           
  Misses       2118     2118           

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[zimeg]

@haleychaas LGTM 🔏 Thanks for avoiding redirects!