chore(specs): Prepare Composition API for GA and remove Beta wording (#4761)

Co-authored-by: Clément Vannicatte <[email protected]>

Author: e-krebs

specs/composition/spec.yml

@@ -1,8 +1,8 @@
 openapi: 3.0.2
 info:
-  title: Composition API (beta)
+  title: Composition API
   description: |
-    The Algolia Composition API lets you run composed search requests on your Compositions. The Composition API is in Beta.
+    The Algolia Composition API lets you run composed search requests on your Compositions.
 
     ## Client libraries