Fix typos and YAML syntax issues (#6628)

* chore: remove trailing colon

Fixes a typo that might confuse users who simply uncomment or copy the
example, leading them to encounter invalid YAML.

* fix: using seaweedfs-s3-secret as default secret for COSI deployment

The default secret name containing the seaweedfs_s3_config secret key
is called "seaweedfs-s3-secret" throughout the configuration. This fix
ensures the COSI driver deployment uses the same consistent name.

* chore!: fix typo

BREAKING CHANGE: Changes name of key in helm-values.

k8s/charts/seaweedfs/templates/master-statefulset.yaml

@@ -139,7 +139,7 @@ spec:
               -mdir=/data \
               -ip.bind={{ .Values.master.ipBind }} \
               {{- if .Values.global.enableReplication }}
-              -defaultReplication={{ .Values.global.replicationPlacment }} \
+              -defaultReplication={{ .Values.global.replicationPlacement }} \
               {{- else }}
               -defaultReplication={{ .Values.master.defaultReplication }} \
               {{- end }}