Address a spelling issue in a comment about FL_GIT_BRANCH_DONT_USE_EN…

…V_VARS

fastlane/Fastfile

@@ -58,7 +58,7 @@ REPOSITORY_NAME = 'WordPress-Android'
 # Used by Fastlane to work around the Google API random failures
 ENV['SUPPLY_UPLOAD_MAX_RETRIES'] = '5'
 
-# Fastlane's `git_branch` action and it's relevant helpers use environment variables to modify
+# Fastlane's `git_branch` action and its relevant helpers use environment variables to modify
 # the output. That means if we change the branch as part of an action, it'll return the incorrect
 # branch. This environment variable disables this behavior: https://github.com/fastlane/fastlane/pull/21597
 ENV['FL_GIT_BRANCH_DONT_USE_ENV_VARS'] = 'true'