tutorial: delete obsolete mention of aliases
The heading says it's going to explain aliases, but it doesn't, and
now that we've documented aliases in config.md, we probably don't need
to mention it in the tutorial.
@@ -126,7 +126,7 @@ edit typically depends on how done you are with the change; if the change is
almost done, it makes sense to use `jj checkout` so you can easily review your
adjustments with `jj diff` before running `jj squash`.
-## The log command, "revsets", and aliases
+## The log command and "revsets"
You're probably familiar with `git log`. Jujutsu has very similar functionality
in its `jj log` command:
