Auto merge of #5888 - bundler:rubymorillo-patch-3, r=indirect
Auto merge of #5888 - bundler:rubymorillo-patch-3, r=indirect

Adding graphs explaining binstubs

Added a paragraph that explains what binstubs is and how it works, per feedback from @arbonap.

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?

The problem was...without an explanation of what binstubs is and what it does, it's difficult for
users to understand where to apply the binstubs command. Shout out to @arbonap for calling this out!

### What was your diagnosis of the problem?

My diagnosis was...to take a wonderful explanation given by @indirect about what binstubs are and turn it into a paragraph! 😄

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

My fix...is two intro paragraphs in the "DESCRIPTION" section, before going into what the command does.

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

I chose this fix because...explanations help users 👍

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