Merge #7322

7322: Fix comments and messages to refer to https url r=bronzdoc a=giraffate

### What was the end-user problem that led to this PR?

End-users experience 301 redirect, or unintentionally visit URL with http.

### What was your diagnosis of the problem?

Following are some examples using curl to explain this problem.

```
$ curl -I http://github.com/capistrano/bundler
HTTP/1.1 301 Moved Permanently
Content-length: 0
Location: https://github.com/capistrano/bundler
```
```
$ curl -I http://guides.rubygems.org/gems-with-extensions/
HTTP/1.1 301 Moved Permanently
Content-Type: text/html
Server: GitHub.com
Location: https://guides.rubygems.org/gems-with-extensions/
X-GitHub-Request-Id: 0A1A:1377:32938B:35C160:5D5D5A84
Content-Length: 162
Accept-Ranges: bytes
Date: Wed, 21 Aug 2019 14:51:49 GMT
Via: 1.1 varnish
Age: 0
Connection: keep-alive
X-Served-By: cache-tyo19949-TYO
X-Cache: MISS
X-Cache-Hits: 0
X-Timer: S1566399109.014809,VS0,VE168
Vary: Accept-Encoding
X-Fastly-Request-ID: 9357ee98e56565f92489c8a4e03235ab60eeb27f
```

### What is your fix for the problem, implemented in this PR?

My fix is to replace http URLs with https URLs.

### Why did you choose this fix out of the possible options?

It's because this fix is simple and easy.


Co-authored-by: Takayuki Nakata <f.seasons017@gmail.com>

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