Update image-stigs.md (#1851)

Fix broken link - hotfix

Signed-off-by: Matthew Helmke <matthew.helmke@chainguard.dev>

content/chainguard/chainguard-images/working-with-images/image-stigs.md

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-The practice of using Security Technical Implementation Guides, or "STIGs," to secure various technologies originated with the United States Department of Defense (DoD). If an organization uses a certain kind of software, say MySQL 8.0, they must ensure that their implementation of it meets the requirements of the [associated Security Requirements Guide (SRG)](https://public.cyber.mil/announcement/stig-update-disa-has-released-the-oracle-mysql-8-0-stig/) in order to qualify as a vendor for the DoD. More recently, other compliance frameworks have begun acknowledging the value of STIGS, with some going so far as to require the use of STIGs in their guidelines.
+The practice of using Security Technical Implementation Guides, or "STIGs," to secure various technologies originated with the United States Department of Defense (DoD). If an organization uses a certain kind of software, say MySQL 8.0, they must ensure that their implementation of it meets the requirements of the [associated Security Requirements Guides (SRG)](https://public.cyber.mil/stigs/) in order to qualify as a vendor for the DoD. More recently, other compliance frameworks have begun acknowledging the value of STIGS, with some going so far as to require the use of STIGs in their guidelines.
 
 [Chainguard announced](https://www.chainguard.dev/unchained/stig-hardening-container-images) the release of a STIG for the [General Purpose Operating System (GPOS) SRG](https://www.stigviewer.com/stig/general_purpose_operating_system_srg/) — an SRG that specifies security requirements for general purpose operating systems running in a network. The goal for this new STIG is that it will help customers confidently and securely integrate Chainguard Images into their workflows. This conceptual article aims to give a brief overview of what STIGs are and how they can be valuable in the context of container images. It also includes instructions on how to get started with Chainguard's STIG for the GPOS SRG.