Adds 6862 release note (quay#1366)

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

Author: stevsmit

modules/rn_3_15_0.adoc

@@ -155,9 +155,6 @@ The following sections note known issues and limitations for {productname} 3.15.
 
 There is a known issue affecting the mirroring feature of {productname}. When the mirroring process fails, the UI shows a *Mirror success* report, even though it has failed. This will be fixed in a future version of {productname}.
 
-[id="limitation-one"]
-=== Limitation 1
-
 [id="deprecations-315"]
 == Future deprecations
 
@@ -170,14 +167,14 @@ The following issues were fixed with {productname} 3.15:
 
 * link:https://issues.redhat.com/browse/PROJQUAY-9050[*PROJQUAY-9050*]. Previously, when in *Tag* view on the v2 UI, the *Pull* column was center-aligned while the other columns were left-aligned. With this release, the *Pull* column is left-aligned.
 
+* link:https://issues.redhat.com/browse/PROJQUAY-6862[*PROJQUAY-6862*]. Previously, when {productname} was deployed with Google Cloud Storage (GCS) as its object storage backend, pushing layers greater than 4 GiB would fail and return a `413` error. This error occurred because {productname}'s library, boto, does not support multipart uploads to GCS. This issue has been resolved, and users can now push layers greater than 4 GiB to their registry without interruption.
+
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
 * link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
-* link:https://issues.redhat.com/browse/PROJQUAY-[*PROJQUAY-*].
-
 
 [id="quay-feature-tracker"]
 == {productname} feature tracker