cli: move jj amend/unamend aliases to config

The `amend/unamend` aliases exist for smoothen onboarding for
Git/Mercurial users; I don't think we should recommend that users use
them, so I think it's fine if users override them as they
like. Therefore, I think they belong in the config.

cli/src/commands/squash.rs

@@ -36,7 +36,6 @@ use crate::ui::Ui;
 /// If a working-copy commit gets abandoned, it will be given a new, empty
 /// commit. This is true in general; it is not specific to this command.
 #[derive(clap::Args, Clone, Debug)]
-#[command(visible_alias = "amend")]
 pub(crate) struct SquashArgs {
     #[arg(long, short, default_value = "@")]
     revision: RevisionArg,

cli/src/commands/unsquash.rs

@@ -36,7 +36,6 @@ use crate::ui::Ui;
 /// If a working-copy commit gets abandoned, it will be given a new, empty
 /// commit. This is true in general; it is not specific to this command.
 #[derive(clap::Args, Clone, Debug)]
-#[command(visible_alias = "unamend")]
 pub(crate) struct UnsquashArgs {
     #[arg(long, short, default_value = "@")]
     revision: RevisionArg,

cli/src/config/misc.toml

@@ -1,7 +1,10 @@
 # The code assumes that this table exists, so don't delete it even if you remove
 # all aliases from here.
 [aliases]
+amend = ["squash"]
 co = ["checkout"]
+unamend = ["unsquash"]
+
 
 [format]
 tree-level-conflicts = true

docs/config.md

@@ -389,7 +389,7 @@ Obviously, you would only set one line, don't copy them all in!
 ## Editing diffs
 
 The `ui.diff-editor` setting affects the tool used for editing diffs (e.g.  `jj
-split`, `jj amend -i`). The default is the special value `:builtin`, which
+split`, `jj squash -i`). The default is the special value `:builtin`, which
 launches a built-in TUI tool (known as [scm-diff-editor]) to edit the diff in
 your terminal.