Tweak toolchain subcommand help text

Author: djc

Diff for: src/cli/rustup_mode.rs

@@ -125,7 +125,7 @@ enum RustupSubcmd {
     #[command(hide = true)]
     DumpTestament,
 
-    /// Modify or query the installed toolchains
+    /// Install, uninstall, or list toolchains
     Toolchain {
         #[command(subcommand)]
         subcmd: ToolchainSubcmd,

Diff for: tests/suite/cli-ui/rustup/rustup_help_cmd_stdout.toml

@@ -9,7 +9,7 @@ The Rust toolchain installer
 Usage: rustup[EXE] [OPTIONS] [+toolchain] [COMMAND]
 
 Commands:
-  toolchain    Modify or query the installed toolchains
+  toolchain    Install, uninstall, or list toolchains
   show         Show the active and installed toolchains or profiles
   update       Update Rust toolchains and rustup
   check        Check for updates to Rust toolchains and rustup

Diff for: tests/suite/cli-ui/rustup/rustup_help_flag_stdout.toml

@@ -9,7 +9,7 @@ The Rust toolchain installer
 Usage: rustup[EXE] [OPTIONS] [+toolchain] [COMMAND]
 
 Commands:
-  toolchain    Modify or query the installed toolchains
+  toolchain    Install, uninstall, or list toolchains
   show         Show the active and installed toolchains or profiles
   update       Update Rust toolchains and rustup
   check        Check for updates to Rust toolchains and rustup

Diff for: tests/suite/cli-ui/rustup/rustup_only_options_stdout.toml

@@ -9,7 +9,7 @@ The Rust toolchain installer
 Usage: rustup[EXE] [OPTIONS] [+toolchain] [COMMAND]
 
 Commands:
-  toolchain    Modify or query the installed toolchains
+  toolchain    Install, uninstall, or list toolchains
   show         Show the active and installed toolchains or profiles
   update       Update Rust toolchains and rustup
   check        Check for updates to Rust toolchains and rustup

Diff for: tests/suite/cli-ui/rustup/rustup_toolchain_cmd_help_flag_stdout.toml

@@ -2,7 +2,7 @@ bin.name = "rustup"
 args = ["toolchain", "--help"]
 stdout = """
 ...
-Modify or query the installed toolchains
+Install, uninstall, or list toolchains
 
 Usage: rustup[EXE] toolchain <COMMAND>