docs: add example glob to jj help git fetch

I tried to clarify the text a bit as well.
jj-vcs · Nov 20, 2024 · aa4830e · aa4830e
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diff --git a/cli/src/commands/git/fetch.rs b/cli/src/commands/git/fetch.rs
@@ -36,7 +36,8 @@ pub struct GitFetchArgs {
     /// Fetch only some of the branches
     ///
     /// By default, the specified name matches exactly. Use `glob:` prefix to
-    /// expand `*` as a glob. The other wildcard characters aren't supported.
+    /// expand `*` as a glob, e.g. `--branch glob:push-*`. Other wildcard
+    /// characters such as `?` are *not* supported.
     #[arg(
         long, short,
         alias = "bookmark",

diff --git a/cli/tests/[email protected] b/cli/tests/[email protected]
@@ -1095,7 +1095,7 @@ If a working-copy commit gets abandoned, it will be given a new, empty commit. T
 
 * `-b`, `--branch <BRANCH>` — Fetch only some of the branches
 
-   By default, the specified name matches exactly. Use `glob:` prefix to expand `*` as a glob. The other wildcard characters aren't supported.
+   By default, the specified name matches exactly. Use `glob:` prefix to expand `*` as a glob, e.g. `--branch glob:push-*`. Other wildcard characters such as `?` are *not* supported.
 
   Default value: `glob:*`
 * `--remote <REMOTE>` — The remote to fetch from (only named remotes are supported, can be repeated)