Merge pull request #287778 from RussellR-MSFT/patch-2

CSS-Networking removing incorrect sentence re 0 cache duration

Author: prmerger-automator[bot]

articles/frontdoor/front-door-rules-engine-actions.md

@@ -51,7 +51,7 @@ When **Caching** is set to **Enabled**, set the following properties:
 | Query parameters | The list of query string parameter names, separated by commas. This property is only set when *Query string caching behavior* is set to *Ignore Specified Query Strings* or *Include Specified Query Strings*. |
 | Compression | <ul><li>**Enabled:** Front Door dynamically compresses content at the edge, resulting in a smaller and faster response. For more information, see [File compression](front-door-caching.md#file-compression). In ARM templates, set the `isCompressionEnabled` property to `Enabled`.</li><li>**Disabled.** Front Door doesn't perform compression. In ARM templates, set the `isCompressionEnabled` property to `Disabled`.</li></ul> |
 | Cache behavior | <ul><li>**Honor origin:** Front Door always honors origin response header directive. If the origin directive is missing, Front Door caches contents anywhere from 1 to 3 days. In ARM templates, set the `cacheBehavior` property to `HonorOrigin`.</li><li>**Override always:** The TTL value returned from your origin is overwritten with the value specified in the action. This behavior only gets applied if the response is cacheable. In ARM templates, set the `cacheBehavior` property to `OverrideAlways`.</li><li>**Override if origin missing:** If no TTL value gets returned from your origin, the rule sets the TTL to the value specified in the action. This behavior only gets applied if the response is cacheable. In ARM templates, set the `cacheBehavior` property to `OverrideIfOriginMissing`.</li></ul> |
-| Cache duration | When _Cache behavior_ is set to `Override always` or `Override if origin missing`, these fields must specify the cache duration to use. The maximum duration is 366 days. For a value of 0 seconds, the CDN caches the content, but must revalidate each request with the origin server. This property is only set when *Cache behavior* is set to *Override always* or *Override if origin missing*.<ul><li>In the Azure portal: specify the days, hours, minutes, and seconds.</li><li>In ARM templates: use the `cacheDuration` to specify the duration in the format `d.hh:mm:ss`. |
+| Cache duration | When _Cache behavior_ is set to `Override always` or `Override if origin missing`, these fields must specify the cache duration to use. The maximum duration is 366 days. This property is only set when *Cache behavior* is set to *Override always* or *Override if origin missing*.<ul><li>In the Azure portal: specify the days, hours, minutes, and seconds.</li><li>In ARM templates: use the `cacheDuration` to specify the duration in the format `d.hh:mm:ss`. |
 
 ### Examples