Typo in live-share/docs/reference insiders.md

[Cargo1284]

There is a typo in the docs

What was your system configuration?
Product and Version [VS/VSCode]: VSCode
OS Version[macOS/Windows]: macOS
Live Share Extension Version: v1.0.765
Target Platform or Language [e.g. Node.js]: n/a

Steps to Reproduce / Scenario:
On insiders.md there is a line that says, "Once such a session in planned in advance, you're able access it from the Live Share viewlet directly." However, the line should say, "Once such a session in planned in advance, you're able *to* access it from the Live Share viewlet directly."

[Cargo1284]

#4897