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Update isset.md (#900)

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Added a sentence to the warning in regards to accessing front matter keys from within shortcodes.
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Tom Doe 2019-10-04 19:32:18 +02:00 committed by Patrick Kollitsch
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content/en/functions/isset.md
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@ -27,5 +27,6 @@ Takes either a slice, array, or channel and an index or a map and a key as input
{{% warning %}}
All site-level configuration keys are stored as lower case. Therefore, a `myParam` key-value set in your [site configuration file](/getting-started/configuration/) needs to be accessed with `{{if isset .Site.Params "myparam"}}` and *not* with `{{if isset .Site.Params "myParam"}}`. Note that you can still access the same config key with `.Site.Params.myParam` *or* `.Site.Params.myparam`, for example, when using [`with`](/functions/with).
This restriction also applies when accessing page-level front matter keys from within [shortcodes](/content-management/shortcodes/).
{{% /warning %}}