Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: jennybc

migrate-rstudio-code.qmd

@@ -16,7 +16,7 @@ Positron can format R code with [Air](https://posit-dev.github.io/air/), a new R
 
 A formatter takes charge of the layout of your R code, which refers to whitespace, newlines, indentation, and the like.
 The goal is to enforce a set of style conventions that enhance readability and robustness.
-Air shares properties with other modern formatters and linters, sush as Black and Ruff for Python:
+Air shares properties with other modern formatters and linters, such as Black and Ruff for Python:
 
 * It's highly opinionated and offers relatively few options for customization.
 * It's written in Rust, which makes it extremely fast.

migrate-rstudio-user-interface.qmd

@@ -40,7 +40,7 @@ This tool can be invoked via the *R: Test R Package in Test Explorer* command, w
 
 Key takeaways for getting comfortable with Positron's UI:
 
-* For file browsing, Git, and Search, head to the the Activity bar.
+* For file browsing, Git, and Search, head to the Activity bar.
 * If you're really missing a button, check if there's a related command in the command palette or just try [the usual keyboard shortcut](migrate-rstudio-keybindings.qmd) and see what happens.
 * If you want to hide or move some elements, it is possible to [customize many aspects of the user interface](user-interface.qmd).