Modules: update the description of the automation modules

[squioc]

• add description for missing one
• remove Markdown link in descriptions
• Improve some descriptions
• Rename the Umbrella automation module into Cisco Umbrella

[github-actions]

Test Results

 49 files  + 48   49 suites  +48   5m 46s ⏱️ + 5m 46s
718 tests +714  676 ✅ +672  40 💤 +40  2 ❌ +2 
726 runs  +722  682 ✅ +678  42 💤 +42  2 ❌ +2 

For more details on these failures, see this check.

Results for commit 93bdd80. ± Comparison against base commit 6085c94.

This pull request removes 4 and adds 718 tests. Note that renamed tests count towards both.

tests.test_actions ‑ test_delete_message
tests.test_actions ‑ test_forward_message
tests.test_actions ‑ test_get_message
tests.test_actions ‑ test_update_message

tests.agents.test_init_scan ‑ test_init_scan
tests.agents.test_isolation ‑ test_endpoint_deisolation
tests.agents.test_isolation ‑ test_endpoint_isolation
tests.agents.test_isolation ‑ test_isolation_and_deisolation_actions
tests.async_client.test_http_client ‑ test_github_client_audit_log_url
tests.async_client.test_http_client ‑ test_github_client_auth_headers
tests.async_client.test_http_client ‑ test_github_client_get_audit_logs_with_api_key
tests.async_client.test_http_client ‑ test_github_client_get_audit_logs_with_pem_file_content
tests.async_client.test_http_client ‑ test_github_client_get_audit_logs_with_pem_file_content_1
tests.async_client.test_http_client ‑ test_github_client_get_audit_logs_with_pem_file_content_3
…