completion: Update docs for new style with positional argument

cli/src/commands/util.rs

@@ -40,13 +40,13 @@ pub(crate) enum UtilCommand {
 
 Apply it by running one of these:
 
-- **bash**: `source <(jj util completion)`
-- **fish**: `jj util completion --fish | source`
+- **bash**: `source <(jj util completion bash)`
+- **fish**: `jj util completion fish | source`
 - **zsh**:
      ```shell
      autoload -U compinit
      compinit
-     source <(jj util completion --zsh)
+     source <(jj util completion zsh)
      ```
 "#]
 #[derive(clap::Args, Clone, Debug)]

cli/tests/cli-reference@.md.snap

@@ -1740,13 +1740,13 @@ Print a command-line-completion script
 
 Apply it by running one of these:
 
-- **bash**: `source <(jj util completion)`
-- **fish**: `jj util completion --fish | source`
+- **bash**: `source <(jj util completion bash)`
+- **fish**: `jj util completion fish | source`
 - **zsh**:
     ```shell
     autoload -U compinit
     compinit
-    source <(jj util completion --zsh)
+    source <(jj util completion zsh)
     ```
 
 **Usage:** `jj util completion [SHELL]`

docs/install-and-setup.md

@@ -156,7 +156,7 @@ $ jj config set --user user.email "[email protected]"
 ## Command-line completion
 
 To set up command-line completion, source the output of
-`jj util completion --bash/--zsh/--fish`. Exactly how to source it
+`jj util completion bash/zsh/fish`. Exactly how to source it
 depends on your shell.
 
 ### Bash
@@ -170,13 +170,13 @@ source <(jj util completion)  # --bash is the default
 ```shell
 autoload -U compinit
 compinit
-source <(jj util completion --zsh)
+source <(jj util completion zsh)
 ```
 
 ### Fish
 
 ```shell
-jj util completion --fish | source
+jj util completion fish | source
 ```
 
 ### Xonsh

flake.nix

@@ -99,9 +99,9 @@
             installManPage ./jj.1
 
             installShellCompletion --cmd jj \
-              --bash <($out/bin/jj util completion --bash) \
-              --fish <($out/bin/jj util completion --fish) \
-              --zsh <($out/bin/jj util completion --zsh)
+              --bash <($out/bin/jj util completion bash) \
+              --fish <($out/bin/jj util completion fish) \
+              --zsh <($out/bin/jj util completion zsh)
           '';
         };
         default = self.packages.${system}.jujutsu;