Fix typo

fcs-core-2.0/interface-specification.adoc

@@ -62,7 +62,7 @@ The value of the `@id` attribute `MUST NOT` contain the characters `,` (comma) o
 
 * one `<ed:SupportedLayers>` element (`REQUIRED` if Endpoint supports _Advanced Search_ capability)
 +
-A list of Layers that are generally supported by this Endpoint. This list is composed of one or more `<ed:SupportedLayer>` elements. The content of a `<ed:SupportedLayer>` `MUST` be the identifier of a Layer (see section <<Layers>>), e.g. orth. Each `<ed:SupportedLayer>` element `MUST` carry an `@id` and a @result-id attribute. The value of the `@id` attribute is later used in the <ed:Resource> element to indicate, which Data View is supported by a resource (see below). The `@result-id` attribute is used in the Advanced Data View (see section <<Advanced (ADV), Advanced Data View>>). Each `<ed:SupportedLayer>` element `MAY` carry an optional `@qualifier` attribute. It is used as a qualifier in a FCS-QL search term in to address this specific layer.
+A list of Layers that are generally supported by this Endpoint. This list is composed of one or more `<ed:SupportedLayer>` elements. The content of a `<ed:SupportedLayer>` `MUST` be the identifier of a Layer (see section <<Layers>>), e.g. orth. Each `<ed:SupportedLayer>` element `MUST` carry an `@id` and a @result-id attribute. The value of the `@id` attribute is later used in the <ed:Resource> element to indicate, which Layer is supported by a resource (see below). The `@result-id` attribute is used in the Advanced Data View (see section <<Advanced (ADV), Advanced Data View>>). Each `<ed:SupportedLayer>` element `MAY` carry an optional `@qualifier` attribute. It is used as a qualifier in a FCS-QL search term in to address this specific layer.
 +
 This list `MUST NOT` include duplicate entries, i.e. no Layer with the same `@result-id` MIME type must appear more than once.
 +