doc/go1.7.txt: 0s for zero duration, go doc groups constructors with types

Change-Id: I4fc35649ff5a3510f5667b62e7e84e113e95dffe
Reviewed-on: https://go-review.googlesource.com/22358Reviewed-by: Rob Pike <r@golang.org>

doc/go1.7.txt

@@ -6,6 +6,7 @@ cmd/link: "-X name value" form gone (CL 19614)
 cmd/compile: smaller binaries (many CLs)
 cmd/go, go/build: add support for Fortran (CL 19670, CL 4114)
 cmd/dist: introduce list subcommand to list all supported platforms (CL 19837)
+cmd/doc: group constructors with types (CL 22354)
 
 Ports:
 
@@ -20,3 +21,4 @@ net/http/httptest: ResponseRecorder supports trailer (CL 20047) (compat impact:
 net/url: support query string without values (CL 19931)
 net/textproto: permit all valid token chars in CanonicalMIMEHeaderKey input (CL 18725)
 go/doc: add Unordered boolean to Example struct (CL 19280)
+time: print zero duration as 0s, not 0 (CL 22357)
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