cmd/doc: implement "go doc struct.field"
By analogy with the handling of methods on types, show the documentation for a single field of a struct. % go doc ast.structtype.fields struct StructType { Fields *FieldList // list of field declarations } % Fixes #19169. Change-Id: I002f992e4aa64bee667e2e4bccc7082486149842 Reviewed-on: https://go-review.googlesource.com/38438Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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