content: remove field and method prefix
The versions page no longer shows the prefix "field" or "method" in
front of one of those symbols.
For golang/go#37102
Trust: Julie Qiu
Run-TryBot: Julie Qiu
TryBot-Result: kokoro
{{define "symbol"}}
<div>
{{if .New}}
- {{if eq .Kind "Method"}}method{{else if eq .Kind "Field"}}field{{end}}
<a href="{{.Link}}">{{end}}{{.Synopsis}} {{if .New}}</a>
{{end}}
{{if .Builds}}
