Mapper doc fixes

doc/features/mapper/defining-mappings/README.md

@@ -6,7 +6,7 @@ In general, you should specify the table name(s) and the naming convention you a
  application models.
 
 ```javascript
-const UnderscoreCqlToCamelCaseMappings = cassandra.mappings.UnderscoreCqlToCamelCaseMappings;
+const UnderscoreCqlToCamelCaseMappings = cassandra.mapping.UnderscoreCqlToCamelCaseMappings;
 
 const mappingOptions = {
   models: {

doc/features/mapper/queries/README.md

@@ -169,15 +169,15 @@ non-negligible performance cost on the server-side so this should be used sparin
 Delete a video
 
 ```javascript
-await videoMapper.delete({ videoId });
+await videoMapper.remove({ videoId });
 ```
 
 #### Delete an object using a [conditional statement][lwt]
 
 Delete a video when the existing name contains a certain value.
 
 ```javascript
-await videoMapper.delete({ videoId }, { when: { name: 'original name' } });
+await videoMapper.remove({ videoId }, { when: { name: 'original name' } });
 ```
 
 ## Group mutations in a batch

docs.yaml

@@ -40,7 +40,7 @@ links:
     href:  https://www.npmjs.org/package/cassandra-driver
 versions:
   - name: '4.0'
-    ref: 'master'
+    ref: '4.0'
   - name: '3.6'
     ref: '3.6'
   - name: '3.5'