fix: doc command

[abeatrix]

I noticed the /doc command built from the current main branch has the following issues:

• a new empty line is added before the
• if you run the /doc command and then reload VS code, your chat will start with the output of your last /doc command in chat view

This PR fixes the issues listed above.

Also merged the prompt with the one tested by Tim in #1198

IMPORTANT: This PR depends on the prompt improvement made in #1198

Test plan

• highlight a function or method in the editor
• right click on the highlighted code, then select Cody>Document Code
• Expected behavior: Docstring added directly above the highlighted code without an extra new line added at the end

Before

https://www.loom.com/share/c1d316d9031d4550952da81d5e5c61fd?sid=3c06e825-e6c3-4c43-a17b-e93f186947a3

before.pull_1273.mp4

After

https://www.loom.com/share/accef38b7f0f4d0c8e1ba8b89581acd2?sid=29fe90a4-9f5e-4a51-8c40-f4adad1c848f

after.pull_1273.mp4

[toolmantim]

Tested the "if you run the /doc command and then reload VS code, your chat will start with the output of your last /doc command in chat view" part of this and works as expected 👍🏼 But I reckon let's leave the prompt changes to the other PR.

[abeatrix]

Tested the "if you run the /doc command and then reload VS code, your chat will start with the output of your last /doc command in chat view" part of this and works as expected 👍🏼 But I reckon let's leave the prompt changes to the other PR.

agree. this PR should not be merged until #1198 is merged

[dominiccooney]

Some feedback inline.

I think we should try to simplify this a bit—only strip one newline, not multiple ones; not prune human text from the transcript?

[dominiccooney]

Looks great! Thank you!

[abeatrix]

@dominiccooney thank you for your thoughtful review as always 🙇‍♀️