Fix link to Ubuntu (#45575)

Author: adegeo

docs/fundamentals/toc.yml

@@ -29,8 +29,8 @@ items:
                   - name: Install
                     href: ../core/install/linux-ubuntu-install.md
                     displayName: ubuntu
-                  - name: Decision Guide
-                    href: ../core/install/linux-ubuntu.md
+                  - name: Decision guide
+                    href: ../core/install/linux-ubuntu-decision.md
                     displayName: ubuntu
               - name: Alpine
                 href: ../core/install/linux-alpine.md