Merge pull request #189 from alex-ball/patch-189

Clarify explanation of staging area

Author: alex-ball

episodes/02-getting-started.md

@@ -297,12 +297,12 @@ and `git commit` then *actually takes* the snapshot, and
 makes a permanent record of it (as a commit).
 If you don't have anything staged when you type `git commit`,
 Git will prompt you to use `git commit -a` or `git commit --all`,
-which is kind of like gathering *everyone* for the picture!
+which is kind of like gathering *everyone* to take a group photo!
 However, it's almost always better to
 explicitly add things to the staging area, because you might
-commit changes you forgot you made. (Going back to snapshots,
-you might get the extra with incomplete makeup walking on
-the stage for the snapshot because you used `-a`!)
+commit changes you forgot you made. (Going back to the group photo simile,
+you might get an extra with incomplete makeup walking on
+the stage for the picture because you used `-a`!)
 Try to stage things manually,
 or you might find yourself searching for "git undo commit" more
 than you would like!