cli: remove jj hide as alias for jj abandon

I haven't heard of anyone using this alias, so let's remove it. It's
easy for users to add it as their own alias if they really want it.

CHANGELOG.md

@@ -47,6 +47,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `jj log`, and `jj obslog`) now accept `--types` to show only the type of file
   before and after.
 
+* `jj hide` (alias for `jj abandon`) is no longer available. Use `jj abandon`
+  instead.
+
 ### Fixed bugs
 
 * Modify/delete conflicts now include context lines

src/commands/mod.rs

@@ -439,7 +439,6 @@ struct DuplicateArgs {
 /// similar to `jj restore`; the difference is that `jj abandon` gives you a new
 /// change, while `jj restore` updates the existing change.
 #[derive(clap::Args, Clone, Debug)]
-#[command(visible_alias = "hide")]
 struct AbandonArgs {
     /// The revision(s) to abandon
     #[arg(default_value = "@")]