Dedent text to make code blocks copyable

[hugovk]

Miss Islington comments on PRs like this:

---

Sorry, @hugovk, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 14cdefa667f211401c9dfab33c4695e80b4e5e95 3.11

---

As plaintext:

Sorry, @hugovk, I could not cleanly backport this to `3.11` due to a conflict. 
                                Please backport using [cherry_picker](https://pypi.org/project/cherry-picker/) on command line.
                                ```
                                cherry_picker 14cdefa667f211401c9dfab33c4695e80b4e5e95 3.11
                                ```
                                

If we dedent it:

Sorry, @hugovk, I could not cleanly backport this to `3.11` due to a conflict. 
Please backport using [cherry_picker](https://pypi.org/project/cherry-picker/) on command line.
```
cherry_picker 14cdefa667f211401c9dfab33c4695e80b4e5e95 3.11
```

Then it renders more nicely:

---

Sorry, @hugovk, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 14cdefa667f211401c9dfab33c4695e80b4e5e95 3.11

---

And note the little copy button on the right which makes it easy to copy the command for pasting into the terminal:

[codecov]

Codecov Report

Merging #647 (42edb8b) into main (9d293cb) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #647   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          356       356           
  Branches        29        29           
=========================================
  Hits           356       356           

Flag	Coverage Δ
Python_3.10	100.00% <100.00%> (ø)
Python_3.11	100.00% <100.00%> (ø)
Python_3.9	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
miss_islington/util.py	100.00% <100.00%> (ø)

[hugovk]

It's working! 🎉

python/cpython#109810 (comment)