Hide --without-password from the sq key generate examples.

- The `sq key generate` examples shouldn't include
    `--without-password`, but it is needed for the automated tests.

  - Hide it.

src/cli/key/generate.rs

@@ -268,7 +268,7 @@ Generate a key, and save it on the key store.",
                 "--name", "Alice",
                 "--email", "alice@example.org",
             ],
-            hide: &[],
+            hide: &["--without-password"],
         }),
         Action::Example(Example {
             comment: "\
@@ -281,7 +281,7 @@ Generate a key, and save it in a file instead of in the key store.",
                 "--output", "alice-priv.pgp",
                 "--rev-cert", "alice-priv.rev",
             ],
-            hide: &[],
+            hide: &["--without-password"],
         }),
         Action::Example(Example {
             comment: "\