chore(docs): update days in advance (#14775)

* chore(docs): update days in advance

This has recently dropped from 60 to 30 days ahead to try and reduce no-shows.

* Update locations

This one's for @sidharthachatterjee :)

* Add more info to guidelines

* chore: format

Author: m-allanson

docs/contributing/pair-programming.md

@@ -24,14 +24,16 @@ If you're interested in support for a commercial Gatsby project, please [get in
 
 We also expect the following from pair programming participants:
 
-- If you have a specific goal for the session, that’s helpful, but we can also choose an open issue to tackle if you’re not sure where to start
+- These sessions tend to work best when you have a specific goal for the session.
+- If you're new to building with Gatsby we recommend [working through the tutorial](https://www.gatsbyjs.org/tutorial/) before your session. If you get stuck part way through that's a great time to book a pairing session.
+- If you're new to contributing to open source we recommend following the ("Setting Up Your Local Dev Environment" guide)[https://www.gatsbyjs.org/contributing/setting-up-your-local-dev-environment/] before your session.
 - All participants are expected to adhere to [Gatsby’s code of conduct](/contributing/code-of-conduct/)
 - We will ask if it’s okay to record our session; you are _not_ required to let us record
 - If the session is recorded, we may post the recording on [Gatsby’s YouTube channel](https://www.youtube.com/channel/UCjnp770qk7ujOq8Q9wiC82w)
 
 ## How to sign up
 
-We allow booking up to 60 days in advance, and spots tend to fill up fast. If we’re all booked up today, check back tomorrow for the next batch of spots. The core team is spread across North America and Europe, so most time zones will have availability during working hours.
+We allow booking up to 30 days in advance, and spots tend to fill up fast. If we’re all booked up today, check back tomorrow for the next batch of spots. The core team is spread across North America, India, and Europe, so most time zones will have availability during working hours.
 
 [Reserve your spot today][cal] and let’s build something amazing together!