Merge pull request android#562 from yogurtearl/patch-1

Update info on contributing to reference `main` branch

Author: yogurtearl

CONTRIBUTING.md

@@ -18,7 +18,7 @@ accept your pull requests.
 
 ## Contributing A Patch
 
-All development is done on the latest `dev_XX` branch. You should base any changes from this branch.
+All development is done on the `main` branch. You should base any changes from this branch.
 
 1. Submit an issue describing your proposed change to the repo in question.
 1. The repo owner will respond to your issue promptly.
@@ -30,4 +30,4 @@ All development is done on the latest `dev_XX` branch. You should base any chang
    [Kotlin Style Guide](https://android.github.io/kotlin-guides/style.html) for the
    recommended coding standards for this organization.
 1. Ensure that your code has an appropriate set of unit tests which all pass.
-1. Submit a pull request targeting the latest `dev_XX` branch.
+1. Submit a pull request targeting the `main` branch.