jj help: note that move, checkout, and merge as deprecated

cli/src/commands/checkout.rs

@@ -20,7 +20,8 @@ use crate::command_error::CommandError;
 use crate::description_util::join_message_paragraphs;
 use crate::ui::Ui;
 
-/// Create a new, empty change and edit it in the working copy
+/// Create a new, empty change and edit it in the working copy (DEPRECATED, use
+/// `jj new`)
 ///
 /// For more information, see
 /// https://github.com/martinvonz/jj/blob/main/docs/working-copy.md.

cli/src/commands/mod.rs

@@ -97,7 +97,7 @@ enum Command {
     Init(init::InitArgs),
     Interdiff(interdiff::InterdiffArgs),
     Log(log::LogArgs),
-    /// Merge work from multiple branches
+    /// Merge work from multiple branches (DEPRECATED, use `jj new`)
     ///
     /// Unlike most other VCSs, `jj merge` does not implicitly include the
     /// working copy revision's parent as one of the parents of the merge;

cli/src/commands/move.rs

@@ -21,7 +21,7 @@ use crate::cli_util::{CommandHelper, RevisionArg};
 use crate::command_error::{user_error, CommandError};
 use crate::ui::Ui;
 
-/// Move changes from one revision into another
+/// Move changes from one revision into another (DEPRECATED, use `jj squash`)
 ///
 /// Use `--interactive` to move only part of the source revision into the
 /// destination. The selected changes (or all the changes in the source revision