Fix small miss in iso subcommand docs

Fix small miss in iso subcommand docs so that it is clearer to
consumers.

Relates to issue #207.

[changelog]
changed: iso subcommand docs to be clearer

<!-- ps-id: 1c098d49-017c-48dc-b74b-6f8b04c770f6 -->

src/cli.rs

@@ -250,8 +250,8 @@ remote with newly rebased patch.
     /// If you have the `isolate_post_checkout` hook setup then that will be executed after
     /// successfully checking out the branch.
     ///
-    /// When you are done manually testing or evaluating the patch in isolation you can return to
-    /// the stack that you were on when you switched into isolation mode by running `gps iso`.
+    /// When you are done manually testing or evaluating the patch(es) in isolation you can return
+    /// to the stack that you were on when you switched into isolation mode by running `gps iso`.
     #[structopt(name = "isolate", alias = "iso")]
     Isolate(IsolateCmdOpts),
     /// (co) - Checkout the patch identified by the patch-index, leaving you