docs: detection rule license info

Author: Neo23x0

LICENSE

@@ -4,4 +4,4 @@ The content of this repository is released under the following licenses:
 
 - The toolchain (everything under tools/) is licensed under the GNU Lesser General Public License
 - The Sigma specification (https://github.com/SigmaHQ/sigma-specification) and the Sigma logo are public domain
-- The rules contained in the SigmaHQ repository (https://github.com/SigmaHQ) are released under the Detection Rule License (DRL) 1.1
+- The rules contained in the SigmaHQ repository (https://github.com/SigmaHQ) are released under the [Detection Rule License (DRL) 1.1](https://github.com/SigmaHQ/Detection-Rule-License)

README.md

@@ -371,7 +371,7 @@ The content of this repository is released under the following licenses:
 
 * The toolchain (everything under tools/) is licensed under the[GNU Lesser General Public License](https://www.gnu.org/licenses/lgpl-3.0.en.html)
 * The [Sigma Specification](https://github.com/SigmaHQ/sigma-specification) and the Sigma logo are public domain
-* The rules contained in the [SigmaHQ repository](https://github.com/SigmaHQ) are released under the [Detection Rule License (DRL) 1.1](https://github.com/SigmaHQ/sigma/blob/master/LICENSE.Detection.Rules.md)
+* The rules contained in the [SigmaHQ repository](https://github.com/SigmaHQ) are released under the [Detection Rule License (DRL) 1.1](https://github.com/SigmaHQ/Detection-Rule-License)
 
 # Credits