rename "note revision" to just "revision"

src/etapi/etapi.openapi.yaml

@@ -308,7 +308,7 @@ paths:
           default: html
     post:
       description: Create a note revision for the given note
-      operationId: createNoteRevision
+      operationId: createRevision
       responses:
         '204':
           description: revision has been created

src/etapi/notes.js

@@ -149,7 +149,7 @@ function register(router) {
     eu.route(router, 'post' ,'/etapi/notes/:noteId/note-revision', (req, res, next) => {
         const note = eu.getAndCheckNote(req.params.noteId);
 
-        note.saveNoteRevision();
+        note.saveRevision();
 
         return res.sendStatus(204);
     });