docs: update documentation for addNote function (#1833)

Co-Authored-By: Virgil <virgilwashere@users.noreply.github.com>

lib/git.js

@@ -318,7 +318,7 @@ async function getNote(ref, execaOptions) {
 }
 
 /**
- * Get and parse the JSON note of a given reference.
+ * Add JSON note to a given reference.
  *
  * @param {Object} note The object to save in the reference note.
  * @param {String} ref The Git reference to add the note to.