[dev.regabi] all: merge master (5faf941) into dev.regabi

Merge List:

+ 2021-02-16 5faf941 internal/goversion: update Version to 1.17
+ 2021-02-16 6f3da9d README: pull gopher image from website
+ 2021-02-16 098504c cmd/link: generate trampoline for inter-dependent packages
+ 2021-02-16 1004a7c runtime/metrics: update documentation to current interface
+ 2021-02-16 6530f26 doc/go1.16: remove draft notice
+ 2021-02-16 353e111 doc/go1.16: fix mismatched id attribute
+ 2021-02-16 f0d23c9 internal/poll: netpollcheckerr before sendfile
+ 2021-02-16 0cb3415 doc: remove all docs not tied to distribution
+ 2021-02-16 626ef08 doc: remove install.html and install-source.html
+ 2021-02-16 30641e3 internal/poll: if copy_file_range returns 0, assume it failed
+ 2021-02-15 33d72fd doc/faq: update generics entry to reflect accepted proposal
+ 2021-02-15 852ce7c cmd/go: provide a more helpful suggestion for "go vet -?"
+ 2021-02-13 66c2709 cmd/link: fix typo in link_test.go

Change-Id: I98f047b79b93c5ceb344dd43408bcb919b23aeb3

Author: cherrymui

README.md

@@ -3,7 +3,7 @@
 Go is an open source programming language that makes it easy to build simple,
 reliable, and efficient software.
 
-![Gopher image](doc/gopher/fiveyears.jpg)
+![Gopher image](https://golang.org/doc/gopher/fiveyears.jpg)
 *Gopher image by [Renee French][rf], licensed under [Creative Commons 3.0 Attributions license][cc3-by].*
 
 Our canonical Git repository is located at https://go.googlesource.com/go.
@@ -19,22 +19,20 @@ BSD-style license found in the LICENSE file.
 Official binary distributions are available at https://golang.org/dl/.
 
 After downloading a binary release, visit https://golang.org/doc/install
-or load [doc/install.html](./doc/install.html) in your web browser for installation
-instructions.
+for installation instructions.
 
 #### Install From Source
 
 If a binary distribution is not available for your combination of
 operating system and architecture, visit
-https://golang.org/doc/install/source or load [doc/install-source.html](./doc/install-source.html)
-in your web browser for source installation instructions.
+https://golang.org/doc/install/source
+for source installation instructions.
 
 ### Contributing
 
 Go is the work of thousands of contributors. We appreciate your help!
 
-To contribute, please read the contribution guidelines:
-	https://golang.org/doc/contribute.html
+To contribute, please read the contribution guidelines at https://golang.org/doc/contribute.html.
 
 Note that the Go project uses the issue tracker for bug reports and
 proposals only. See https://golang.org/wiki/Questions for a list of