Fixes syntax issue Quay (quay#1186)

Co-authored-by: Steven Smith <[email protected]>

Author: stevsmit

modules/operator-upgrade.adoc

@@ -69,7 +69,7 @@ To update {productname} from one minor version to the next, for example, 3.12.z
 
 For `z` stream upgrades, for example, 3.12.1 -> 3.12.2, updates are released in the major-minor channel that the user initially selected during install. The procedure to perform a `z` stream upgrade depends on the `approvalStrategy` as outlined above. If the approval strategy is set to `Automatic`, the {productname} Operator upgrades automatically to the newest `z` stream. This results in automatic, rolling {productname} updates to newer `z` streams with little to no downtime. Otherwise, the update must be manually approved before installation can begin.
 
-[upgrading-312-to-313]
+[id="upgrading-312-to-313"]
 === Upgrading from {productname} 3.12 to 3.13
 
 With {productname} 3.13, the `volumeSize` parameter has been implemented for use with the `clairpostgres` component of the `QuayRegistry` custom resource definition (CRD). This replaces the `volumeSize` parameter that was previously used for the `clair` component of the same CRD.