Auto merge of #6302 - 315tky:master, r=indirect
Auto merge of #6302 - 315tky:master, r=indirect

Document `# frozen_string_literal` in `bundle init` Gemfile

Thanks so much for the contribution!
To make reviewing this PR a bit easier, please fill out answers to the following questions.

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

An enhancement request to bundle-init docu as per - issue 6140

### What was your diagnosis of the problem?

n/a

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

Updated the man/bundle-init.ronn file to include brief description of frozen string literal, and added a SEE ALSO section with link to Gemfile(5) webpage

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

File edited to try and reflect the previous discussion regarding what was required.

(cherry picked from commit 5fb9e9a08512828ad93663787ac9cffbda5d599e)

bundler/bundler,mvz/bundler,dilumnavanjana/bundler,mvz/bundler,dilumnavanjana/bundler,bundler/bundler