update changelog entry text

Signed-off-by: Andreas Gerstmayr <[email protected]>

.chloggen/unset_images_in_cr.yaml

@@ -13,4 +13,6 @@ issues: [674]
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-subtext: From 0.6.0 onwards, the image location is not stored in the TempoStack CR unless it got changed manually
+subtext: |
+  This upgrade reverts any change to the `spec.images` fields of any TempoStack instance.
+  Beginning with version 0.6.0, the image location is not stored in the TempoStack instance unless it is changed manually.