mgr/dashboard: Rephrase dedicated pool helper in rbd create form

Fixes: https://tracker.ceph.com/issues/67893

Signed-off-by: Aashish Sharma <[email protected]>

Author: Aashish Sharma

src/pybind/mgr/dashboard/frontend/src/app/ceph/block/rbd-form/rbd-form.component.html

@@ -176,8 +176,8 @@
                       i18n>
                       Use a dedicated data pool
 
-          <cd-help-text>Use a dedicated pool to store the mirror data. If not selected,
-            the mirror data will be stored in the same pool as the image data.
+          <cd-help-text>Use a dedicated pool to store the image data. If not selected,
+            the image data will be stored in the same pool as the image metadata.
           </cd-help-text>
 
           <cd-helper *ngIf="allDataPools.length <= 1 && mode !== 'editing'">