add note about git tag verification in features

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

content/en/blog/2023-08-28-announcing-flux-v2.1.0/index.md

@@ -38,6 +38,9 @@ different Flux versions at https://endoflife.date/flux.
 - The [GitRepository API](https://fluxcd.io/flux/components/source/gitrepositories/)
   has a new field `.spec.proxySecretRef` that is used for specifying proxy configuration to use
   for all remote Git operations related to the particular object.
+- The`.spec.verify.mode` field of the [GitRepository API](https://fluxcd.io/flux/components/source/gitrepositories/)
+  now accepts one of the following values `HEAD`, `Tag`, `TagAndHEAD`. These values are used to specify
+  how the Git tags and commits are verified.
 - The [server-side apply behaviour](https://fluxcd.io/flux/components/kustomize/kustomizations/#controlling-the-apply-behavior-of-resources)
   in the kustomize-controller has been extended with two extra policies:
   `IfNotPresent` and `Ignore`. These policies are specified with the `kustomize.toolkit.fluxcd.io/ssa`