Remove depreacted rule references

Author: shashank-elastic

docs/detections/prebuilt-rules/downloadable-packages/8-19-11/prebuilt-rules-8-19-11-appendix.asciidoc

@@ -94,4 +94,3 @@ include::prebuilt-rule-8-19-11-service-creation-via-local-kerberos-authenticatio
 include::prebuilt-rule-8-19-11-potential-privileged-escalation-via-samaccountname-spoofing.asciidoc[]
 include::prebuilt-rule-8-19-11-remote-computer-account-dnshostname-update.asciidoc[]
 include::prebuilt-rule-8-19-11-suspicious-seincreasebasepriorityprivilege-use.asciidoc[]
-include::prebuilt-rule-8-19-11-deprecated-aws-root-login-without-mfa.asciidoc[]

docs/detections/prebuilt-rules/downloadable-packages/8-19-11/prebuilt-rules-8-19-11-summary.asciidoc

@@ -189,6 +189,4 @@ This section lists all updates associated with version 8.19.11 of the Fleet inte
 
 |<<prebuilt-rule-8-19-11-suspicious-seincreasebasepriorityprivilege-use, Suspicious SeIncreaseBasePriorityPrivilege Use>> | Identifies attempts to use the SeIncreaseBasePriorityPrivilege privilege by an unusual process. This could be related to hijack execution flow of a process via threats priority manipulation. | update | 2 
 
-|<<prebuilt-rule-8-19-11-deprecated-aws-root-login-without-mfa, Deprecated - AWS Root Login Without MFA>> | Identifies attempts to login to AWS as the root user without using multi-factor authentication (MFA). Amazon AWS best practices indicate that the root user should be protected by MFA. | deprecated | 213 
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