docs: Fix build-process.svg linking in building-fcos.md
@@ -14,7 +14,7 @@ nav_order: 2
The following schema summarize the build process used with COSA to build Fedora
CoreOS:
-<img src="../build-process.svg?sanitize=true">
+<img src="./build-process.svg?sanitize=true">
See [Updating the build process SVG](build-process-mermaid.md) to update this
schema.
