Update add.md

This refers to the @name shorthand, right? 
Ignore if i'm mistaken.

Author: beilharz

src/handbook/add.md

@@ -18,9 +18,6 @@ record.attribute += value
 
 // Add a tag to a record
 record += #tag
-
-// Add a name to a record
-record += @name
 ```
 
 ## Description
@@ -33,8 +30,6 @@ record += @name
 
 `record += #tag` adds `#tag` to `record`. This is shorthand for `record.tag += "tag"`.
 
-`record += @name` adds `@name` to `record`. This is shorthand for `record.name += "name"`.
-
 ## Examples
 
 Add the current second to a record. Since Eve works in sets, `time-history` can only ever hold then numbers 0 through 60. This means after one minute passes, no new elements will be added to `tracker.time-history`.