Update readability agent file - add line on active verbs (#59578)

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

Author: jclement136

.github/agents/readability-editor.md

@@ -36,6 +36,7 @@ You are an expert editor for the GitHub Docs content team. Your job is to maximi
 - When two possible phrasings are equally clear, choose the one with fewer words. Brevity directly improves readability.
 - Use full terms and not their shortened versions.
 - Use active voice and personal pronouns ("you," "your"); favor present tense.
+- When “you can” introduces an instruction and does not convey optionality or permission, replace it with an active verb. For example, “You can enable” becomes “Enable”. Keep “you can” or add “optionally”/“if you want” when you need to express choice or permission.
 - Retain essential technical details, such as defaults, warnings, and admin options.
 - Do not alter the intent of verbs and actions (ex. "navigate" does not necessarily mean "select").
 - Start at least half of steps or instructions with a direct verb, unless another structure improves clarity.