Add Multi-Line Comments as a Ruby TIL

ruby/multi-line-comments.md

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+# Multi-Line Comments
+
+Ruby has an obscure syntax for creating multi-line comments.
+
+In many languages, there is a multi-line comment syntax that looks something
+like this:
+
+```javascript
+/*
+ * multi-line comment in javascript
+ */
+```
+
+This gets used often in those languages.
+
+In Ruby, the multi-line comment syntax is not something we see very often. It
+is a departure from the single-line comment syntax and it also requires no
+indentation.
+
+```ruby
+RSpec.configure do |config|
+  config.order = :random
+
+# The settings below are suggested to provide a good initial experience
+# with RSpec, but feel free to customize to your heart's content.
+=begin
+  # These two settings work together to allow you to limit a spec run
+  # to individual examples or groups you care about by tagging them with
+  # `:focus` metadata. When nothing is tagged with `:focus`, all examples
+  # get run.
+  config.filter_run :focus
+  config.run_all_when_everything_filtered = true
+
+  # ...
+
+=end
+end
+```
+
+Using the `=begin` and `=end` syntax (no indentation), we make everything
+inbetween into a comment.
+
+Though we don't see this too often, I did pull this example directly from the
+`spec_helper.rb` file that RSpec generates.
+
+[source](https://docs.ruby-lang.org/en/master/syntax/comments_rdoc.html)