docs: update according to changes in collection

Cf. backend!62

content/_index.md

@@ -14,8 +14,8 @@ The [Ahiqar TextAPI]({{< ref "text-api-specs" >}}) is fully compliant to the gen
 The terminology of the generic TextAPI applies as follows:
 
 * **Collection**: In Ahiqar, refers to two levels: First it means the *main collection* of the Ahiqar project which contains the all manuscripts to be edited.
-    Second, it refers to the *three language collections*, `arabic`, `karshuni`, and `syriac` with which the manuscripts are associated.
-    Having two layers of collections also results in the API calls to have two collection URIs.
+    Second, it refers to the *language collections*, `arabic-karshuni` and `syriac` with which the manuscripts are associated.
+    While `syriac` corresponds to the Syriac language collection, `arabic-karshuni` combines the Arabic and the Karshuni language collection.
 * **Manifest**: The term „Manifest“ refers to the TextGrid edition object which holds information about the associated XML document as well as the facsimiles.
 * **Item**: „Items“ means pages within an edition in Ahiqar.
     These are encoded in `tei:pb/@n`.

content/page/text-api-specs.md

@@ -61,19 +61,27 @@ It is REQUIRED to use the `https` protocol.
 
 Returns a [Collection Object](#collection-object).
 
+`collection` MUST be either `syriac` or `arabic-karshuni`.
+
+#### Sample Call
+
 `https://ahikar.sub.uni-goettingen.de/api/textapi/ahikar/{collection}/collection.json`
 
 ### Manifest
 
 Returns a [Manifest Object](#manifest-object).
 
-`https://ahikar.sub.uni-goettingen.de/api/textapi/ahikar/{collection}/{document}/manifest.json`
+#### Sample Call
+
+`https://ahikar.sub.uni-goettingen.de/api/textapi/ahikar/{collection}/{manifest}/manifest.json`
 
 ### Item
 
 Returns an [Item Object](#item-object).
 
-`https://ahikar.sub.uni-goettingen.de/api/textapi/ahikar/{collection}/{document}/latest/item.json`
+#### Sample Call
+
+`https://ahikar.sub.uni-goettingen.de/api/textapi/ahikar/{collection}/{manifest}/{item}/latest/item.json`
 
 ## Schema
 
@@ -98,7 +106,7 @@ It is served at the corresponding [endpoint](#collection).
 ### Manifest Object
 
 This is the main object in the schema to represent a single text, its derivatives
-(e.g. HTML) and therefore containing the metadata.
+(e.g. HTML) and associated images.
 It is REQUIRED to be served at the corresponding [endpoint](#manifest).
 
 | Field Name | Cardinality | Type | Description |